1 John 5:15

and if we have known that He doth hear us, whatever we may ask, we have known that we have the requests that we have requested from Him.

Proverbs 15:29

Far is Jehovah from the wicked, And the prayer of the righteous He heareth.

Jeremiah 15:12-13

Doth one break iron -- northern iron, and brass?

Mark 11:24

Because of this I say to you, all whatever -- praying -- ye do ask, believe that ye receive, and it shall be to you.

Luke 11:9-10

and I say to you, Ask, and it shall be given to you; seek, and ye shall find; knock, and it shall be opened to you;

1 John 5:18-20

We have known that every one who hath been begotten of God doth not sin, but he who was begotten of God doth keep himself, and the evil one doth not touch him;

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
Far is Jehovah from the wicked, And the prayer of the righteous He heareth.
Jeremiah 15:12
Doth one break iron -- northern iron, and brass?

We know

Mark 11:24
Because of this I say to you, all whatever -- praying -- ye do ask, believe that ye receive, and it shall be to you.
Luke 11:9
and I say to you, Ask, and it shall be given to you; seek, and ye shall find; knock, and it shall be opened to you;

General references

Psalm 20:4
He doth give to thee according to thy heart, And all thy counsel doth fulfil.
Isaiah 65:24
And it hath come to pass, They do not yet call, and I answer, They are yet speaking, and I hear.
Matthew 21:22
and all -- as much as ye may ask in the prayer, believing, ye shall receive.'