Hebrews 10:26

For if we wilfully persist in sin after having received the full knowledge of the truth, there no longer remains in reserve any other sacrifice for sins.

2 Peter 2:20-22

For if, after escaping from the pollutions of the world through a full knowledge of our Lord and Saviour Jesus Christ, people are once more entangled in these pollutions and are overcome, their last state has become worse than their first.

1 John 5:16

If any one sees a brother man committing a sin which is not unto death, he shall ask and God shall give him life--for those who do not sin unto death. There is such a thing as sin unto death; for that I do not bid him make request.

Luke 12:47

And that servant who has been told his Master's will and yet made no preparation and did not obey His will, will receive many lashes.

John 9:41

"If you were blind," answered Jesus, "you would have no sin; but as a matter of fact you boast that you see. So your sin remains!"

John 13:17

If you know all this, blessed are you if you act accordingly.

John 15:22-24

"If I had not come and spoken to them, they would have had no sin; but as the case stands they are without excuse for their sin.

2 Thessalonians 2:10

and by every kind of wicked deception for those who are on the way to perdition because they did not welcome into their hearts the love of the truth, so that they might be saved.

1 Timothy 1:13

though I was previously a blasphemer and a persecutor and had been insolent in outrage. Yet mercy was shown me, because I had acted ignorantly, not having as yet believed;

Hebrews 6:4-6

For it is impossible, in the case of those who have once for all been enlightened, and have tasted the sweetness of the heavenly gift, and have been made partakers of the Holy Spirit,

Matthew 12:43-45

"No sooner however has the foul spirit gone out of the man, then he roams about in places where there is no water, seeking rest but finding none.

Matthew 12:31-32

This is why I tell you that men may find forgiveness for every other sin and impious word, but that for impious speaking against the Holy Spirit they shall find no forgiveness.

James 4:17

If, however, a man knows what it is right to do and yet does not do it, he commits a sin.

Treasury of Scripture Knowledge

Summary

For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,

Bible References

If

Hebrews 6:4
For it is impossible, in the case of those who have once for all been enlightened, and have tasted the sweetness of the heavenly gift, and have been made partakers of the Holy Spirit,
Matthew 12:31
This is why I tell you that men may find forgiveness for every other sin and impious word, but that for impious speaking against the Holy Spirit they shall find no forgiveness.
John 9:41
"If you were blind," answered Jesus, "you would have no sin; but as a matter of fact you boast that you see. So your sin remains!"
1 Timothy 1:13
though I was previously a blasphemer and a persecutor and had been insolent in outrage. Yet mercy was shown me, because I had acted ignorantly, not having as yet believed;
2 Peter 2:20
For if, after escaping from the pollutions of the world through a full knowledge of our Lord and Saviour Jesus Christ, people are once more entangled in these pollutions and are overcome, their last state has become worse than their first.
1 John 5:16
If any one sees a brother man committing a sin which is not unto death, he shall ask and God shall give him life--for those who do not sin unto death. There is such a thing as sin unto death; for that I do not bid him make request.

General references

Matthew 7:27
The heavy rain descends, the swollen torrents come, and the winds blow and burst upon the house, and it falls; and disastrous is the fall."
Matthew 24:21
for it will be a time of great suffering, such as never has been from the beginning of the world till now, and assuredly never will be again.
Mark 3:28
In solemn truth I tell you that all their sins may be pardoned to the sons of men, and all their blasphemies, however they may have blasphemed;
Luke 12:10
"Moreover every one who shall speak against the Son of Man, may obtain forgiveness; but he who blasphemes the Holy Spirit will never obtain forgiveness.