Acts 1:24

And they prayed, and said, You, Lord, who know the hearts of all men, show which of these two you have chosen,

1 Samuel 16:7

But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the LORD sees not as man sees; for man looks on the outward appearance, but the LORD looks on the heart.

Jeremiah 17:10

I the LORD search the heart, I test the mind, even to give every man according to his ways, and according to the fruit of his doings.

Acts 15:8

And God, who knows the hearts, bore them witness, giving them the Holy Spirit, even as he did unto 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 I will kill her children with death; and all the churches shall know that I am he who searches the minds and hearts: and I will give unto every one of you according to your works.

Numbers 27:16

Let the LORD, the God of the spirits of all flesh, set a man over the congregation,

1 Kings 8:39

Then hear you in heaven your dwelling place, and forgive, and act, and give to every man according to his ways, whose heart you know; (for you, even you only, know the hearts of all the children of men;)

1 Chronicles 28:9

And you, Solomon my son, know you the God of your father, and serve him with a perfect heart and with a willing mind: for the LORD searches all hearts, and understands all the imaginations of the thoughts: if you seek him, he will be found of you; but if you forsake him, he will cast you off forever.

1 Chronicles 29:17

I know also, my God, that you test the heart, and have pleasure in uprightness. As for me, in the uprightness of my heart I have willingly offered all these things: and now have I seen with joy your people, who are present here, to offer willingly unto you.

Psalm 7:9

Oh let the wickedness of the wicked come to an end; but establish the just: for the righteous God tests the minds and hearts.

Psalm 44:21

Shall not God search this out? for he knows the secrets of the heart.

Proverbs 3:5-6

Trust in the LORD with all your heart; and lean not unto your own understanding.

Proverbs 15:11

Sheol and destruction are before the LORD: how much more then the hearts of the children of men?

Jeremiah 11:20

But, O LORD of hosts, who judges righteously, who tests the mind and the heart, let me see your vengeance on them: for unto you have I revealed my cause.

Jeremiah 20:12

But, O LORD of hosts, who tests the righteous, and sees the mind and the heart, let me see your vengeance on them: for unto you have I opened my cause.

Luke 6:12-13

And it came to pass in those days, that he went out into a mountain to pray, and continued all night in prayer to God.

John 2:24-25

But Jesus did not commit himself unto them, because he knew all men,

John 21:17

He said unto him the third time, Simon, son of Jonas, do you love me? Peter was grieved because he said unto him the third time, Do you love me? And he said unto him, Lord, you know all things; you know that I love you. Jesus said unto him, Feed my sheep.

Acts 13:2-3

As they ministered to 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 when they had ordained elders in every church, and had prayed with fasting, they commended them to the Lord, on whom they believed.

Romans 8:27

And he that searches the hearts knows what is the mind of the Spirit, because he makes intercession for the saints according to the will of God.

Hebrews 4:13

Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto 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
As they ministered to the Lord, and fasted, the Holy Spirit said, Separate me Barnabas and Saul for the work to which I have called them.
Proverbs 3:5
Trust in the LORD with all your heart; and lean not unto your own understanding.
Luke 6:12
And it came to pass in those days, that he went out into a mountain to pray, and continued all night in prayer to God.

Thou, lord

Acts 15:8
And God, who knows the hearts, bore them witness, giving them the Holy Spirit, even as he did unto us;
Numbers 27:16
Let the LORD, the God of the spirits of all flesh, set a man over the congregation,
1 Samuel 16:7
But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the LORD sees not as man sees; for man looks on the outward appearance, but the LORD looks on the heart.
1 Kings 8:39
Then hear you in heaven your dwelling place, and forgive, and act, and give to every man according to his ways, whose heart you know; (for you, even you only, know the hearts of all the children of men;)
1 Chronicles 28:9
And you, Solomon my son, know you the God of your father, and serve him with a perfect heart and with a willing mind: for the LORD searches all hearts, and understands all the imaginations of the thoughts: if you seek him, he will be found of you; but if you forsake him, he will cast you off forever.
1 Chronicles 29:17
I know also, my God, that you test the heart, and have pleasure in uprightness. As for me, in the uprightness of my heart I have willingly offered all these things: and now have I seen with joy your people, who are present here, to offer willingly unto you.
Psalm 7:9
Oh let the wickedness of the wicked come to an end; but establish the just: for the righteous God tests the minds and hearts.
Psalm 44:21
Shall not God search this out? for he knows the secrets of the heart.
Proverbs 15:11
Sheol and destruction are before the LORD: how much more then the hearts of the children of men?
Jeremiah 11:20
But, O LORD of hosts, who judges righteously, who tests the mind and the heart, let me see your vengeance on them: for unto you have I revealed my cause.
Jeremiah 17:10
I the LORD search the heart, I test the mind, even to give every man according to his ways, and according to the fruit of his doings.
Jeremiah 20:12
But, O LORD of hosts, who tests the righteous, and sees the mind and the heart, let me see your vengeance on them: for unto you have I opened my cause.
John 2:24
But Jesus did not commit himself unto them, because he knew all men,
John 21:17
He said unto him the third time, Simon, son of Jonas, do you love me? Peter was grieved because he said unto him the third time, Do you love me? And he said unto him, Lord, you know all things; you know that I love you. Jesus said unto him, Feed my sheep.
Hebrews 4:13
Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
Revelation 2:23
And I will kill her children with death; and all the churches shall know that I am he who searches the minds and hearts: and I will give unto every one of you according to your works.