John 15:22

If I had not come and spoken to them, they would not have sin, but now they have no excuse for their sin.

John 9:41

Jesus said to them, "If you were blind, you would have no guilt; but now that you say, 'We see,' your sin remains.

Romans 1:20

For since the creation of the world his invisible nature, even his eternal power and deity, has been clearly seen, being understood by the things that have been made. So they are without excuse;

Luke 12:46

the master of that servant will come on a day when he does not expect him, and at an hour he is not aware of, and he will cut him to pieces and assign him a place with the unbelievers.

John 3:18-21

He who believes in him is not condemned; but he who does not believe is condemned already, because he has not believed in the name of the only Son of God.

John 12:48

He who rejects me and does not receive my words has a judge; the word that I have spoken will condemn him on the last day.

John 19:11

Jesus answered, "You would have no power over me unless it had been given you from above. Therefore the one who delivered me to you has the greater sin."

Acts 17:30

The times of ignorance God overlooked, but now he commands all people everywhere to repent,

Romans 2:1

Therefore you have no excuse, O man, whoever you are who judge another; for in whatever point you pass judgment on him you condemn yourself, because you, the judge, are doing the very same things.

2 Corinthians 2:14-16

But thanks be to God, who in Christ always leads us in triumph, and through us spreads the fragrance of the knowledge of him everywhere.

Hebrews 6:4-8

For it is impossible for those who have once been enlightened, who have tasted the heavenly gift, and have become partakers of the Holy Spirit,

James 4:17

Therefore, to one who knows the right thing to do and does not do it, to him it is sin.

1 Peter 2:16

Live as free men, but do not use your freedom as a covering for evil; live as servants of God.

Treasury of Scripture Knowledge

Summary

If I had not come and spoken unto them, they had not had sin: but now they have no cloke for their sin.

General references

Bible References

Cloke

Romans 1:20
For since the creation of the world his invisible nature, even his eternal power and deity, has been clearly seen, being understood by the things that have been made. So they are without excuse;
Romans 2:1
Therefore you have no excuse, O man, whoever you are who judge another; for in whatever point you pass judgment on him you condemn yourself, because you, the judge, are doing the very same things.
1 Peter 2:16
Live as free men, but do not use your freedom as a covering for evil; live as servants of God.

General references

Luke 10:14
But it will be more tolerable for Tyre and Sidon at the judgment than for you.
John 16:9
of sin, because they do not believe in me;
James 4:17
Therefore, to one who knows the right thing to do and does not do it, to him it is sin.