Mark 9:29
Jesus answered, “This kind cannot come out, except by prayer.”

Matthew 6:16-18
When you fast, do not be somber like the hypocrites, for they disfigure their faces to show men they are fasting. Truly I tell you, they already have their full reward. / But when you fast, anoint your head and wash your face, / so that your fasting will not be obvious to men, but only to your Father, who is unseen. And your Father, who sees what is done in secret, will reward you.

Matthew 21:21-22
“Truly I tell you,” Jesus replied, “if you have faith and do not doubt, not only will you do what was done to the fig tree, but even if you say to this mountain, ‘Be lifted up and thrown into the sea,’ it will happen. / If you believe, you will receive whatever you ask for in prayer.”

Luke 11:9-10
So I tell you: Ask, and it will be given to you; seek, and you will find; knock, and the door will be opened to you. / For everyone who asks receives; he who seeks finds; and to him who knocks, the door will be opened.

James 5:16
Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous man has great power to prevail.

1 Corinthians 7:5
Do not deprive each other, except by mutual consent and for a time, so you may devote yourselves to prayer. Then come together again, so that Satan will not tempt you through your lack of self-control.

Acts 13:2-3
While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for Me Barnabas and Saul for the work to which I have called them.” / And after they had fasted and prayed, they laid their hands on them and sent them off.

Isaiah 58:6
Isn’t this the fast that I have chosen: to break the chains of wickedness, to untie the cords of the yoke, to set the oppressed free and tear off every yoke?

Joel 2:12
“Yet even now,” declares the LORD, “return to Me with all your heart, with fasting, weeping, and mourning.”

Daniel 9:3
So I turned my attention to the Lord God to seek Him by prayer and petition, with fasting, sackcloth, and ashes.

Ezra 8:21-23
And there by the Ahava Canal I proclaimed a fast, so that we might humble ourselves before our God and ask Him for a safe journey for us and our children, with all our possessions. / For I was ashamed to ask the king for an escort of soldiers and horsemen to protect us from our enemies on the road, since we had told him, “The hand of our God is gracious to all who seek Him, but His great anger is against all who forsake Him.” / So we fasted and petitioned our God about this, and He granted our request.

Nehemiah 1:4
When I heard these words, I sat down and wept. I mourned for days, fasting and praying before the God of heaven.

2 Chronicles 20:3
Jehoshaphat was alarmed and set his face to seek the LORD. And he proclaimed a fast throughout Judah.

Jonah 3:5-10
And the Ninevites believed God. They proclaimed a fast and dressed in sackcloth, from the greatest of them to the least. / When word reached the king of Nineveh, he got up from his throne, took off his royal robe, covered himself with sackcloth, and sat in ashes. / Then he issued a proclamation in Nineveh: “By the decree of the king and his nobles: Let no man or beast, herd or flock, taste anything at all. They must not eat or drink. ...

Esther 4:16
“Go and assemble all the Jews who can be found in Susa, and fast for me. Do not eat or drink for three days, night or day, and I and my maidens will fast as you do. After that, I will go to the king, even though it is against the law. And if I perish, I perish!”