Mark 2:8

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?

1 Chronicles 29:17

I know also, my God, that thou triest the heart, and hast pleasure in uprightness. As for me, in the uprightness of mine heart I have willingly offered all these things: and now have I seen with joy thy people, which are present here, to offer willingly unto thee.

Psalm 139:2

Thou knowest my downsitting and mine uprising, thou understandest my thought afar off.

Proverbs 15:26

The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.

Proverbs 24:9

The thought of foolishness is sin: and the scorner is an abomination to men.

Isaiah 55:7

Let the wicked forsake his way, and the unrighteous man his thoughts: and let him return unto the LORD, and he will have mercy upon him; and to our God, for he will abundantly pardon.

Ezekiel 38:10

Thus saith the Lord GOD; It shall also come to pass, that at the same time shall things come into thy mind, and thou shalt think an evil thought:

Matthew 9:4

And Jesus knowing their thoughts said, Wherefore think ye 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 when Jesus perceived their thoughts, he answering said unto them, What reason ye in your hearts?

Luke 6:8

But he knew their thoughts, and said to the man which had the withered hand, Rise up, and stand forth in the midst. And he arose and stood forth.

Luke 7:39-40

Now when the Pharisee which had bidden him saw it, he spake within himself, saying, This man, if he were a prophet, would have known who and what manner of woman this is that toucheth him: for she is a sinner.

Luke 24:38

And he said unto them, Why are ye troubled? and why do thoughts arise in your hearts?

John 2:24-25

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

John 6:64

But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.

John 21:17

He saith unto him the third time, Simon, son of Jonas, lovest thou me? Peter was grieved because he said unto him the third time, Lovest thou me? And he said unto him, Lord, thou knowest all things; thou knowest that I love thee. Jesus saith unto him, Feed my sheep.

Acts 5:3

But Peter said, Ananias, why hath Satan filled thine heart to lie to the Holy Ghost, and to keep back part of the price of the land?

Acts 8:22

Repent therefore of this thy wickedness, and pray God, if perhaps the thought of thine heart may be forgiven thee.

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 which searcheth the reins and hearts: and I will give unto 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 thou triest the heart, and hast pleasure in uprightness. As for me, in the uprightness of mine heart I have willingly offered all these things: and now have I seen with joy thy people, which are present here, to offer willingly unto thee.
Matthew 9:4
And Jesus knowing their thoughts said, Wherefore think ye evil in your hearts?
Luke 5:22
But when Jesus perceived their thoughts, he answering said unto them, What reason ye in your hearts?
Luke 6:8
But he knew their thoughts, and said to the man which had the withered hand, Rise up, and stand forth in the midst. And he arose and stood forth.
Luke 7:39
Now when the Pharisee which had bidden him saw it, he spake within himself, saying, This man, if he were a prophet, would have known who and what manner of woman this is that toucheth him: for she is a sinner.
John 2:24
But Jesus did not commit himself unto them, because he knew all men,
John 6:64
But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.
John 21:17
He saith unto him the third time, Simon, son of Jonas, lovest thou me? Peter was grieved because he said unto him the third time, Lovest thou me? And he said unto him, Lord, thou knowest all things; thou knowest that I love thee. Jesus saith 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 which searcheth the reins and hearts: and I will give unto 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
Thou knowest my downsitting and mine uprising, thou understandest my thought afar off.
Proverbs 15:26
The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.
Proverbs 24:9
The thought of foolishness is sin: and the scorner is an abomination to men.
Isaiah 55:7
Let the wicked forsake his way, and the unrighteous man his thoughts: and let him return unto the LORD, and he will have mercy upon him; and to our God, for he will abundantly pardon.
Ezekiel 38:10
Thus saith the Lord GOD; It shall also come to pass, that at the same time shall things come into thy mind, and thou shalt think an evil thought:
Luke 24:38
And he said unto them, Why are ye troubled? and why do thoughts arise in your hearts?
Acts 5:3
But Peter said, Ananias, why hath Satan filled thine heart to lie to the Holy Ghost, and to keep back part of the price of the land?
Acts 8:22
Repent therefore of this thy wickedness, and pray God, if perhaps the thought of thine heart may be forgiven thee.

General references

John 20:23
Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.

King James Version Public Domain