John 15:22

If I had not come and spoken to them, they would not have [the guilt of their] sin; but now they have no excuse for their sin.

John 9:41

Jesus said to them, “If you were blind [to spiritual things], you would have no sin [and would not be blamed for your unbelief]; but since you claim to have [spiritual] sight, [you have no excuse so] your sin and guilt remain.

Romans 1:20

For ever since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through His workmanship [all His creation, the wonderful things that He has made], so that they [who fail to believe and trust in Him] are without excuse and without defense.

Ezekiel 2:5

As for them, whether they listen or refuse [to listen]—for they are a rebellious house—yet they will know and be fully aware of the fact that there has been a prophet among them.

Ezekiel 33:31-33

They come to you as people come, and they sit before you as My people, and they hear your words, but they do not practice them; for with their mouth they express loving devotion, but their heart goes after their (unlawful) gain.

Luke 12:46

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

John 3:18-21

Whoever believes and has decided to trust in Him [as personal Savior and Lord] is not judged [for this one, there is no judgment, no rejection, no condemnation]; but the one who does not believe [and has decided to reject Him as personal Savior and Lord] is judged already [that one has been convicted and sentenced], because he has not believed and trusted in the name of the [One and] only begotten Son of God [the One who is truly unique, the only One of His kind, the One who alone can save him].

John 12:48

Whoever rejects Me and refuses to accept My teachings, has one who judges him; the very word that I spoke will judge and condemn him on the last day.

John 19:11

Jesus answered, “You would have no authority over Me at all if it had not been given to you from above. For this reason the sin and guilt of the one who handed Me over to you is greater [than your own].”

Acts 17:30

Therefore God overlooked and disregarded the former ages of ignorance; but now He commands all people everywhere to repent [that is, to change their old way of thinking, to regret their past sins, and to seek God’s purpose for their lives],

Romans 2:1

Therefore you have no excuse or justification, everyone of you who [hypocritically] judges and condemns others; for in passing judgment on another person, you condemn yourself, because you who judge [from a position of arrogance or self-righteousness] are habitually practicing the very same things [which you denounce].

2 Corinthians 2:14-16

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

Hebrews 6:4-8

For [it is impossible to restore to repentance] those who have once been enlightened [spiritually] and who have tasted and consciously experienced the heavenly gift and have shared in the Holy Spirit,

James 4:17

So any person who knows what is right to do but does not do it, to him it is sin.

1 Peter 2:16

Live as free people, but do not use your freedom as a cover or pretext for evil, but [use it and live] as bond-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 ever since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through His workmanship [all His creation, the wonderful things that He has made], so that they [who fail to believe and trust in Him] are without excuse and without defense.
Romans 2:1
Therefore you have no excuse or justification, everyone of you who [hypocritically] judges and condemns others; for in passing judgment on another person, you condemn yourself, because you who judge [from a position of arrogance or self-righteousness] are habitually practicing the very same things [which you denounce].
1 Peter 2:16
Live as free people, but do not use your freedom as a cover or pretext for evil, but [use it and live] as bond-servants of God.

General references

Luke 10:14
However, it will be more tolerable for Tyre and Sidon in the judgment than for you.
John 16:9
about sin [and the true nature of it], because they do not believe in Me [and My message];
James 4:17
So any person who knows what is right to do but does not do it, to him it is sin.