Mark 2:8

And instantly knowing in His spirit that they reasoned so within themselves, He said to them, Why do you reason these things in your heart?

1 Chronicles 29:17

I know also, my God, that You try the heart, and have pleasure in uprightness. I, in the uprightness of my heart, have willingly offered all these things. And now I have seen with joy Your people who are present here to offer willingly to You.

Psalm 139:2

You know my sitting down and my rising up; You understand my thought afar off.

Proverbs 15:26

The thoughts of the wicked are very hateful to Jehovah, but the words of the pure are pleasant words.

Proverbs 24:9

The thought of foolishness is sin; and the scorner is hateful to men.

Isaiah 55:7

Let the wicked forsake his way, and the unrighteous man his thoughts; and let him return to Jehovah, and He will have mercy on him; and to our God, for He will abundantly pardon.

Ezekiel 38:10

So says the Lord Jehovah: And it shall be in that day that things shall come into your heart, and you shall devise an evil plan.

Matthew 9:4

And Jesus, knowing their thoughts, said, Why do you think evil in your hearts?

Mark 7:21

For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,

Luke 5:22

But knowing their thoughts, answering, Jesus said to them, Why do you reason in your hearts?

Luke 6:8

But He knew their thoughts and said to the man who had the withered hand, Rise up and stand in the middle. And he arose and stood.

Luke 7:39-40

But seeing this, the Pharisee who had invited Him, spoke within himself, saying, This man, if he were a prophet, would have known who and what kind of woman this is who touches him, for she is a sinner.

Luke 24:38

And He said to them, Why are you troubled, and why do thoughts arise in your hearts?

John 2:24-25

But Jesus did not commit Himself to them, because He knew all

John 6:64

But there are some of you who do not believe. For Jesus knew from the beginning who they were who did not believe, and who is the one betraying Him.

John 21:17

He said to him the third time, Simon, son of Jonah, do you love Me? Peter was grieved because He said to him a third time, Do you love Me? And he said to Him, Lord, You know all things, You know that I love You. Jesus said to him, Feed My sheep.

Acts 5:3

But Peter said, Ananias, why has Satan filled your heart for you to lie to the Holy Spirit, and to keep back part of the price of the land?

Acts 8:22

Therefore repent of this wickedness of yours, and pray God if perhaps the thought of your heart may be forgiven you.

Hebrews 4:13

Neither is there any creature that is not manifest in His sight, but all things are naked and opened to 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 will know that I am He who searches the reins and hearts, and I will give to every one of you according to your works.

Treasury of Scripture Knowledge

Summary

And immediately when Jesus perceived in his spirit that they so reasoned within themselves, he said unto them, Why reason ye these things in your hearts?

General references

Bible References

When

1 Chronicles 29:17
I know also, my God, that You try the heart, and have pleasure in uprightness. I, in the uprightness of my heart, have willingly offered all these things. And now I have seen with joy Your people who are present here to offer willingly to You.
Matthew 9:4
And Jesus, knowing their thoughts, said, Why do you think evil in your hearts?
Luke 5:22
But knowing their thoughts, answering, Jesus said to them, Why do you reason in your hearts?
Luke 6:8
But He knew their thoughts and said to the man who had the withered hand, Rise up and stand in the middle. And he arose and stood.
Luke 7:39
But seeing this, the Pharisee who had invited Him, spoke within himself, saying, This man, if he were a prophet, would have known who and what kind of woman this is who touches him, for she is a sinner.
John 2:24
But Jesus did not commit Himself to them, because He knew all
John 6:64
But there are some of you who do not believe. For Jesus knew from the beginning who they were who did not believe, and who is the one betraying Him.
John 21:17
He said to him the third time, Simon, son of Jonah, do you love Me? Peter was grieved because He said to him a third time, Do you love Me? And he said to Him, Lord, You know all things, You know that I love You. Jesus said to 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 to 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 will know that I am He who searches the reins and hearts, and I will give to every one of you according to your works.

Why

Mark 7:21
For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
Psalm 139:2
You know my sitting down and my rising up; You understand my thought afar off.
Proverbs 15:26
The thoughts of the wicked are very hateful to Jehovah, but the words of the pure are pleasant words.
Proverbs 24:9
The thought of foolishness is sin; and the scorner is hateful to men.
Isaiah 55:7
Let the wicked forsake his way, and the unrighteous man his thoughts; and let him return to Jehovah, and He will have mercy on him; and to our God, for He will abundantly pardon.
Ezekiel 38:10
So says the Lord Jehovah: And it shall be in that day that things shall come into your heart, and you shall devise an evil plan.
Luke 24:38
And He said to them, Why are you troubled, and why do thoughts arise in your hearts?
Acts 5:3
But Peter said, Ananias, why has Satan filled your heart for you to lie to the Holy Spirit, and to keep back part of the price of the land?
Acts 8:22
Therefore repent of this wickedness of yours, and pray God if perhaps the thought of your heart may be forgiven you.

General references

John 20:23
Of whomever sins you remit, they are remitted to them. Of whomever sins you retain, they are retained.