Mark 11:24 NIV

1 John 3:22 NIV
and receive from him anything we ask, because we keep his commands and do what pleases him.

1 John 5:14-15 NIV
This is the confidence we have in approaching God: that if we ask anything according to his will, he hears us. And if we know that he hears us—whatever we ask—we know that we have what we asked of him.

James 1:5-6 NIV
If any of you lacks wisdom, you should ask God, who gives generously to all without finding fault, and it will be given to you. But when you ask, you must believe and not doubt, because the one who doubts is like a wave of the sea, blown and tossed by the wind.

James 5:15-18 NIV
And the prayer offered in faith will make the sick person well; the Lord will raise them up. If they have sinned, they will be forgiven. Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous person is powerful and effective. Elijah was a human being, even as we are. He prayed earnestly that it would not rain, and it did not rain on the land for three and a half years. Again he prayed, and the heavens gave rain, and the earth produced its crops.

John 14:13 NIV
And I will do whatever you ask in my name, so that the Father may be glorified in the Son.

John 15:7 NIV
If you remain in me and my words remain in you, ask whatever you wish, and it will be done for you.

John 16:23-27 NIV
In that day you will no longer ask me anything. Very truly I tell you, my Father will give you whatever you ask in my name. Until now you have not asked for anything in my name. Ask and you will receive, and your joy will be complete. “Though I have been speaking figuratively, a time is coming when I will no longer use this kind of language but will tell you plainly about my Father. In that day you will ask in my name. I am not saying that I will ask the Father on your behalf. No, the Father himself loves you because you have loved me and have believed that I came from God.

Luke 11:9-13 NIV
“So I say to 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; the one who seeks finds; and to the one who knocks, the door will be opened. “Which of you fathers, if your son asks for a fish, will give him a snake instead? Or if he asks for an egg, will give him a scorpion? If you then, though you are evil, know how to give good gifts to your children, how much more will your Father in heaven give the Holy Spirit to those who ask him!”

Luke 18:1-8 NIV
Then Jesus told his disciples a parable to show them that they should always pray and not give up. He said: “In a certain town there was a judge who neither feared God nor cared what people thought. And there was a widow in that town who kept coming to him with the plea, ‘Grant me justice against my adversary.’ “For some time he refused. But finally he said to himself, ‘Even though I don’t fear God or care what people think, yet because this widow keeps bothering me, I will see that she gets justice, so that she won’t eventually come and attack me!’” And the Lord said, “Listen to what the unjust judge says. And will not God bring about justice for his chosen ones, who cry out to him day and night? Will he keep putting them off? I tell you, he will see that they get justice, and quickly. However, when the Son of Man comes, will he find faith on the earth?”

Matthew 18:19 NIV
“Again, truly I tell you that if two of you on earth agree about anything they ask for, it will be done for them by my Father in heaven.