Acts 1:24

And praying, they said, Do thou, Lord, the searcher of all hearts, show which of these two thou hast chosen

Acts 15:8

And the heart-searching God testified to them, giving to them the Holy Spirit even as to us,

Acts 6:6

and set them before the Apostles; and they having prayed imposed hands on them.

Revelation 2:23

And her children will I kill with pestilence, and all the churches shall know that I am he that searches the minds and hearts, and I will give you each one according to your works.

Luke 6:12-13

AND in those days he went out on the mountain to pray, and spent the whole night in prayer to God.

John 2:24-25

but Jesus did not trust himself to them, because he knew all men,

John 21:17

He said to him a third time; Simon, son of John, are you a friend to me? Peter was grieved that he said to him the third time, Are you a friend to me? and he said to him, Lord you know all things; you know that I am a friend to you. Jesus said to him, Feed my sheep.

Acts 13:2-3

And while they served the Lord and fasted, the Holy Spirit said, Separate me Barnabas and Saul for the work to which I have called them.

Acts 14:23

And having appointed them elders in every church, and having prayed with fasting, they commended them to the Lord in whom they had believed.

Romans 8:27

and he that searches the hearts knows what is the mind of the Spirit, because it makes intercession with God for the saints.

Hebrews 4:13

and there is nothing which is not manifest in his sight; for all things are naked and exposed to his eyes, to whom our discourse relates.

Treasury of Scripture Knowledge

Summary

And they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen,

Bible References

They

Acts 13:2
And while they served the Lord and fasted, the Holy Spirit said, Separate me Barnabas and Saul for the work to which I have called them.
Luke 6:12
AND in those days he went out on the mountain to pray, and spent the whole night in prayer to God.

Thou, lord

Acts 15:8
And the heart-searching God testified to them, giving to them the Holy Spirit even as to us,
John 2:24
but Jesus did not trust himself to them, because he knew all men,
John 21:17
He said to him a third time; Simon, son of John, are you a friend to me? Peter was grieved that he said to him the third time, Are you a friend to me? and he said to him, Lord you know all things; you know that I am a friend to you. Jesus said to him, Feed my sheep.
Hebrews 4:13
and there is nothing which is not manifest in his sight; for all things are naked and exposed to his eyes, to whom our discourse relates.
Revelation 2:23
And her children will I kill with pestilence, and all the churches shall know that I am he that searches the minds and hearts, and I will give you each one according to your works.