Acts 1:24

and they prayed, saying. "Thou, O Lord, who knowest the hearts of all men, show clearly which of these two men thou hast chosen to fill the place

Acts 15:8

"And God, who knows the hearts of all, gave this testimony in their behalf, by bestowing upon them the Holy Spirit just as he did upon us;

Acts 6:6

These men they presented to the apostles who, when they had prayed, laid their hands upon them.

Revelation 2:23

And moreover, her children will I kill with pestilence. And all the churches shall know that I am he who searches the hearts and souls of men. I will give to each of you according to his works.

Luke 6:12-13

It happened about that time that he went out into the mountain to pray. He continued all night in prayer to God.

John 2:24-25

but for his part Jesus was not trusting himself to them, because he knew all men,

John 21:17

The third time Jesus asked him, "Am I really dear to you?" Peter was grieved because the third time he asked, "Am I really dear to you?" and he answered, "Master, you know all things, you know that you are dear to me."

Acts 13:2-3

And as they were worshiping the Lord, and fasting, the Holy Spirit said to them, "Separate me Barnabas and Saul for the work to which I have called them."

Acts 14:23

They chose elders for them in every church, after prayer and fasting, and commended them to the Lord in whom they had believed.

Romans 8:27

And the Searcher of Hearts knows what the Sprit's meaning is, because his intercessions for the saints are according to the will of God.

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 as they were worshiping the Lord, and fasting, the Holy Spirit said to them, "Separate me Barnabas and Saul for the work to which I have called them."
Luke 6:12
It happened about that time that he went out into the mountain to pray. He continued all night in prayer to God.

Thou, lord

Acts 15:8
"And God, who knows the hearts of all, gave this testimony in their behalf, by bestowing upon them the Holy Spirit just as he did upon us;
John 2:24
but for his part Jesus was not trusting himself to them, because he knew all men,
John 21:17
The third time Jesus asked him, "Am I really dear to you?" Peter was grieved because the third time he asked, "Am I really dear to you?" and he answered, "Master, you know all things, you know that you are dear to me."
Revelation 2:23
And moreover, her children will I kill with pestilence. And all the churches shall know that I am he who searches the hearts and souls of men. I will give to each of you according to his works.