Acts 1:24

And they prayed saying, Thou, Lord, who knowest the hearts of all men, show which of these two thou hast chosen

Acts 15:8

And God, who knoweth the heart, bore them witness, giving them the Holy Spirit, as he gave it to us;

Acts 6:6

whom they set before the apostles; and when they had prayed, they laid their hands on them.

Revelation 2:23

And her children I will slay with death; and all the churches shall know that I am he who searcheth the reins and hearts; and I will give to every one of you according to your works.

Luke 6:12-13

And it came to pass in those days, that he went out into the mountain to pray; and he continued all 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 saith to him the third time, Simon, son of John, lovest thou me? Peter was grieved because he said to him the third time, Lovest thou me? And he said to him, Lord, thou knowest all things; thou knowest that I love thee. He saith to him, Feed my sheep.

Acts 13:2-3

And while they were ministering to the Lord, and fasting, the Holy Spirit said, Set apart for me Barnabas and Saul for the work to which I have called them.

Acts 14:23

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

Romans 8:27

But he that searcheth the hearts knoweth the mind of the Spirit, because it intercedeth for the holy according to the will of God.

Hebrews 4:13

and there is no creature that is not manifest in his sight; but all things are naked and laid open to the eyes of him with whom we have to do.

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 were ministering to the Lord, and fasting, the Holy Spirit said, Set apart for me Barnabas and Saul for the work to which I have called them.
Luke 6:12
And it came to pass in those days, that he went out into the mountain to pray; and he continued all night in prayer to God.

Thou, lord

Acts 15:8
And God, who knoweth the heart, bore them witness, giving them the Holy Spirit, as he gave it to us;
John 2:24
But Jesus did not trust himself to them, because he knew all men;
John 21:17
He saith to him the third time, Simon, son of John, lovest thou me? Peter was grieved because he said to him the third time, Lovest thou me? And he said to him, Lord, thou knowest all things; thou knowest that I love thee. He saith to him, Feed my sheep.
Hebrews 4:13
and there is no creature that is not manifest in his sight; but all things are naked and laid open to the eyes of him with whom we have to do.
Revelation 2:23
And her children I will slay with death; and all the churches shall know that I am he who searcheth the reins and hearts; and I will give to every one of you according to your works.