1 John 5:15

And if we are certain that he gives ear to all our requests, we are equally certain that we will get our requests.

Proverbs 15:29

The Lord is far from sinners, but his ear is open to the prayer of the upright.

Jeremiah 15:12-13

Is it possible for iron to be broken; even iron from the north, and brass?

Mark 11:24

For this reason I say to you, Whatever you make a request for in prayer, have faith that it has been given to you, and you will have it.

Luke 11:9-10

And I say to you, Make requests, and they will be answered; what you are searching for, you will get; when you give the sign, the door will be open to you.

1 John 5:18-20

We are certain that one who is a child of God will do no sin, but the Son of God keeps him so that he is not touched by the Evil One.

Treasury of Scripture Knowledge

Summary

And if we know that he hear us, whatsoever we ask, we know that we have the petitions that we desired of him.

Bible References

If

Proverbs 15:29
The Lord is far from sinners, but his ear is open to the prayer of the upright.
Jeremiah 15:12
Is it possible for iron to be broken; even iron from the north, and brass?

We know

Mark 11:24
For this reason I say to you, Whatever you make a request for in prayer, have faith that it has been given to you, and you will have it.
Luke 11:9
And I say to you, Make requests, and they will be answered; what you are searching for, you will get; when you give the sign, the door will be open to you.

General references

Psalm 20:4
May he give you your heart's desire, and put all your purposes into effect.
Isaiah 65:24
And before they make their request I will give an answer, and while they are still making prayer to me, I will give ear.
Matthew 21:22
And all things, whatever you make request for in prayer, having faith, you will get.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain