Luke 6:41

"And why do you look at the splinter that is in your brother's eye, but never consider the beam that is in your own eye?

John 8:7

But Jesus stooped down, and began to write on the ground with his finger. When they continued to question him, he raised himself and said to them, "Let the innocent man among you be the first to throw the stone at her."

Matthew 7:3-5

"And why do you look at the mote in your brother's eye, and fail to notice the beam which is in your own eye?

John 8:40-44

"But now you are seeking to kill me?? man who has told you the truth which I heard from God. Abraham did not do that.

Romans 2:1

You are therefore inexcusable, O man, whoever you are, that sits in judgment; for in judging another you are condemning yourself. You, the judge, are habitually practising the very same things.

Romans 2:21-24

You who are preaching that a man should not steal, do you practise theft?

James 1:24

for after he has looked carefully at himself, he goes away, and at once forgets what he is like.

Treasury of Scripture Knowledge

Summary

And why beholdest thou the mote that is in thy brother's eye, but perceivest not the beam that is in thine own eye?

Bible References

Why

Matthew 7:3
"And why do you look at the mote in your brother's eye, and fail to notice the beam which is in your own eye?
Romans 2:1
You are therefore inexcusable, O man, whoever you are, that sits in judgment; for in judging another you are condemning yourself. You, the judge, are habitually practising the very same things.

But

John 8:7
But Jesus stooped down, and began to write on the ground with his finger. When they continued to question him, he raised himself and said to them, "Let the innocent man among you be the first to throw the stone at her."
James 1:24
for after he has looked carefully at himself, he goes away, and at once forgets what he is like.