Mark 2:8

Now Jesus at once felt in His spirit that they were arguing about this, and said, "Why are you arguing to yourselves about this?

Matthew 9:4

And Jesus knew their thoughts, and said, "Why do you have such wicked thoughts in your hearts?

Mark 7:21

for from the inside, that is, from the hearts of men, designs for doing evil come, sexual immorality, stealing, murder,

Luke 5:22

Jesus saw that they were arguing, and answered them: "Why are you arguing so in your hearts?

Luke 6:8

But He knew what they were thinking, and He said to the man with the withered hand, "Get up and stand at the front." So he got up and stood there.

Luke 7:39-40

So when the Pharisee who invited Him saw it, he said to himself, "If He were really a prophet, He would know who and of what character the woman is who is clinging to Him -- that she is a social outcast."

Luke 24:38

But He said to them, "Why are you so disturbed and why are doubts arising in your hearts?

John 2:24-25

But He would not trust Himself to them, because He knew all men

John 6:64

But there are some of you who do not trust in me." For Jesus knew from the start who they were that did not trust in Him, and who it was that was going to betray Him.

John 21:17

For the third time Jesus asked him, "Simon, son of John, do you really tenderly love me?" Peter was hurt because Jesus the third time asked him, "Do you really tenderly love me?" So he answered Him, "Lord, you know everything; you know that I do tenderly love you." Jesus said to him, "Then feed my sheep.

Acts 5:3

And Peter said, "Ananias, why has Satan so completely possessed your heart that you have lied to the Holy Spirit and kept back for yourselves a part of the money received for the land?

Acts 8:22

So repent of this wickedness of yours, and pray to the Lord, to see if this thought of your heart may be forgiven you.

Hebrews 4:13

No creature of His can escape God's sight, but everything is bare and exposed to the eyes of Him to whom we have to give account.

Revelation 2:23

and I will surely strike her children dead. So all the churches will know that I am He who searches men's inmost hearts, and that I will repay each of you for exactly what you have done.

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

Matthew 9:4
And Jesus knew their thoughts, and said, "Why do you have such wicked thoughts in your hearts?
Luke 5:22
Jesus saw that they were arguing, and answered them: "Why are you arguing so in your hearts?
Luke 6:8
But He knew what they were thinking, and He said to the man with the withered hand, "Get up and stand at the front." So he got up and stood there.
Luke 7:39
So when the Pharisee who invited Him saw it, he said to himself, "If He were really a prophet, He would know who and of what character the woman is who is clinging to Him -- that she is a social outcast."
John 2:24
But He would not trust Himself to them, because He knew all men
John 6:64
But there are some of you who do not trust in me." For Jesus knew from the start who they were that did not trust in Him, and who it was that was going to betray Him.
John 21:17
For the third time Jesus asked him, "Simon, son of John, do you really tenderly love me?" Peter was hurt because Jesus the third time asked him, "Do you really tenderly love me?" So he answered Him, "Lord, you know everything; you know that I do tenderly love you." Jesus said to him, "Then feed my sheep.
Hebrews 4:13
No creature of His can escape God's sight, but everything is bare and exposed to the eyes of Him to whom we have to give account.
Revelation 2:23
and I will surely strike her children dead. So all the churches will know that I am He who searches men's inmost hearts, and that I will repay each of you for exactly what you have done.

Why

Mark 7:21
for from the inside, that is, from the hearts of men, designs for doing evil come, sexual immorality, stealing, murder,
Luke 24:38
But He said to them, "Why are you so disturbed and why are doubts arising in your hearts?
Acts 5:3
And Peter said, "Ananias, why has Satan so completely possessed your heart that you have lied to the Holy Spirit and kept back for yourselves a part of the money received for the land?
Acts 8:22
So repent of this wickedness of yours, and pray to the Lord, to see if this thought of your heart may be forgiven you.

General references

John 20:23
If you get forgiveness for people's sins, they are forgiven them; if you let people's sins fasten upon them, they will remain fastened upon them."