"If there be in the land famine, if there be pestilence, blight, mildew, locust, or if there be caterpillar, if their enemy besiege them in the land of their cities, whatsoever plague, whatsoever sickness there be, what prayer and supplication soever be made by any man or by all Thy people Israel, who shall know every man the plague of his own heart and spread forth his hands toward this house--then hear Thou in heaven Thy dwelling place, and forgive, and do, and give to every man according to his ways, whose heart Thou knowest..." then hear Thou in heaven their prayer and their supplication, and maintain their cause.
1 Kings 8:37-39, 45

And it came to pass, before Isaiah had gone out into the middle court, that the word of the LORD came to him, saying, "Turn back and tell Hezekiah the captain of My people, `Thus saith the LORD, the God of David thy father: I have heard thy prayer, I have seen thy tears; behold, I will heal thee. On the third day thou shalt go up unto the house of the LORD. And I will add unto thy days fifteen years; and I will deliver thee and this city out of the hand of the king of Assyria. And I will defend this city for Mine own sake and for My servant David's sake.'"
2 Kings 20:4-6

Depart from me, all ye workers of iniquity, for the LORD hath heard the voice of my weeping. The LORD hath heard my supplication; the LORD will receive my prayer. Let all mine enemies be ashamed and sorely vexed; let them turn back and be put to shame suddenly.
Psalm 6:8-10

"Hear my prayer, O LORD, and give ear unto my cry; hold not Thy peace at my tears; for I am a stranger with Thee and a sojourner, as all my fathers were. O spare me, that I may recover strength before I go hence and am no more."
Psalm 39:12-13

Yet the LORD will command His lovingkindness in the daytime, and in the night His song shall be with me and my prayer unto the God of my life. I will say unto God my rock, "Why hast Thou forgotten me? Why go I mourning because of the oppression of the enemy?"
Psalm 42:8-9

Save me, O God, by Thy name, and judge me by Thy strength. Hear my prayer, O God; give ear to the words of my mouth. For strangers are risen up against me, and oppressors seek after my soul; they have not set God before them. Selah
Psalm 54:1-3

Give ear to my prayer, O God, and hide not Thyself from my supplication. Attend unto me and hear me; I mourn in my complaint and moan, because of the voice of the enemy, because of the oppression of the wicked; for they cast iniquity upon me, and in wrath they hate me.
Psalm 55:1-3

Hear my cry, O God; attend unto my prayer. From the end of the earth will I cry unto Thee when my heart is overwhelmed; lead me to the rock that is higher than I. For Thou hast been a shelter for me and a strong tower from the enemy.
Psalm 61:1-3

Hear my voice, O God, in my prayer; preserve my life from fear of the enemy. Hide me from the secret counsel of the wicked, from the insurrection of the workers of iniquity, who whet their tongue like a sword and bend their bows to shoot their arrows, even bitter words, that they may shoot in secret at the perfect; suddenly do they shoot at him and fear not.
Psalm 64:1-4

They go from strength to strength; every one of them in Zion appeareth before God. O LORD God of hosts, hear my prayer; give ear, O God of Jacob. Selah Behold, O God our shield, and look upon the face of Thine anointed.
Psalm 84:7-9

O LORD God of my salvation, I have cried day and night before Thee. Let my prayer come before Thee; incline Thine ear unto my cry. For my soul is full of troubles, and my life draweth nigh unto the grave...Shall Thy wonders be known in the dark? And Thy righteousness in the land of forgetfulness? But unto Thee have I cried, O LORD, and in the morning shall my prayer come before Thee. LORD, why castest Thou off my soul? Why hidest Thou Thy face from me?
Psalm 88:1-3, 12-14

Hear my prayer, O LORD, and let my cry come unto Thee. Hide not Thy face from me in the day when I am in trouble; incline Thine ear unto me. In the day when I call, answer me speedily. For my days are consumed like smoke, and my bones are burned as a hearth.
Psalm 102:1-3

LORD, I cry unto Thee! Make haste unto me! Give ear unto my voice when I cry unto Thee. Let my prayer be set before Thee as incense, and the lifting up of my hands as the evening sacrifice. Set a watch, O LORD, before my mouth; keep the door of my lips. Incline not my heart to any evil thing, to practice wicked works with men that work iniquity; and let me not eat of their dainties. Let the righteous smite me: it shall be a kindness. And let him reprove me: it shall be as an excellent oil, which shall not break my head; for yet my prayer shall be with them in their calamities. When their judges are overthrown onto stony places, they shall hear my words, for they are sweet.
Psalm 141:1-6

The lips of the wise disperse knowledge, but the heart of the foolish doeth not so. The sacrifice of the wicked is an abomination to the LORD, but the prayer of the upright is His delight. The way of the wicked is an abomination unto the LORD, but He loveth him that followeth after righteousness... The heart of the righteous studieth how to answer, but the mouth of the wicked poureth out evil things. The LORD is far from the wicked, but He heareth the prayer of the righteous.
Proverbs 15:7-9, 28-29

And I set my face unto the Lord God, seeking by prayer and supplications, with fasting, and sackcloth, and ashes. And I prayed unto the LORD my God, and made my confession and said, "O Lord, the great and fearsome God, keeping the covenant and mercy to them that love Him and to them that keep His commandments...
Daniel 9:3-4

And Jesus rebuked the devil, and he departed out of him, and the child was cured from that very hour. Then came the disciples to Jesus apart and said, "Why could we not cast him out?" And Jesus said unto them, "Because of your unbelief; for verily I say unto you, if ye have faith as a grain of mustard seed, ye shall say unto this mountain, `Remove hence to yonder place,' and it shall remove. And nothing shall be impossible unto you. However this kind goeth not out but by prayer and fasting."
Matthew 17:18-21

"Again I say unto you, that if two of you shall agree on earth concerning anything that they shall ask, it shall be done for them by My Father who is in Heaven. For where two or three are gathered together in My name, there am I in the midst of them."
Matthew 18:19-20

And Jesus went into the temple of God, and cast out all those who sold and bought in the temple, and overthrew the tables of the moneychangers and the seats of those who sold doves, and said unto them, "It is written, `My house shall be called the house of prayer,' but ye have made it a den of thieves." And the blind and the lame came to Him in the temple, and He healed them...Jesus answered and said unto them, "Verily I say unto you, if ye have faith and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, `Be thou removed and be thou cast into the sea,' it shall be done. And all things whatsoever ye shall ask in prayer, believing, ye shall receive."
Matthew 21:12-14. 21-22 and Mark 11:17

And when He had come into the house, His disciples asked Him privately, "Why could not we cast him out?" And He said unto them, "This kind can come forth by nothing but by prayer and fasting."
Mark 9:28-29

But we will give ourselves continually to prayer and to the ministry of the Word.
Acts 6:4

Peter therefore was kept in prison, but prayer was made without ceasing by the church unto God for him.
Acts 12:5

And take the helmet of salvation and the sword of the Spirit, which is the Word of God, praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints. And pray for me, that utterance may be given unto me, that I may open my mouth boldly to make known the mystery of the Gospel...
Ephesians 6:17-19

Let your moderation be known to all men. The Lord is at hand. Fret not about anything, but in everything, by prayer and supplication with thanksgiving, let your requests be made known unto God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
Philippians 4:5-7

For every creature of God is good, and nothing to be refused if it be received with thanksgiving; for it is sanctified by the Word of God and prayer.
1 Timothy 4:4-5

Now she that is indeed a widow, and desolate, trusteth in God and continueth in supplications and prayers night and day.
1 Timothy 5:5

I thank God, whom I serve from my forefathers with pure conscience, that I have thee in remembrance in my prayers night and day without ceasing. I greatly desire to see thee, being mindful of thy tears, that I may be filled with joy.
2 Timothy 1:3-4

I thank my God, making mention of thee always in my prayers.
Philemon 1:4

Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
James 5:16

For the eyes of the Lord are over the righteous, and His ears are open unto their prayers; but the face of the Lord is against them that do evil."
1 Peter 3:12

But the end of all things is at hand: be ye therefore sober and watch unto prayer.
1 Peter 4:7