Hebrews 10:26

For if we sin willfully, after we have received the knowledge of the truth, there remains no longer a sacrifice for sins;

2 Peter 2:20-22

For if, after they have escaped the pollutions of the world, through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in these, and overcome by them, the last state of such is worse than the first.

1 John 5:16

If any one see his brother sinning a sin not to death, he shall ask, and he will give him life for those who sin not to death. There is a sin to death: I do not say concerning this, that he should ask.

Luke 12:47

And that servant who knew his lord's will, but made no preparation, nor did according to his will, shall be beaten with many stripes;

John 9:41

Jesus said to them: If you were blind, you would not have sin; but now you say, We see; therefore your sin remains.

John 13:17

If you know these things, blessed are you, if you do them.

John 15:22-24

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

2 Thessalonians 2:10

and with all the delusion of unrighteousness in those who perish, because they did not receive the love of the truth, in order that they might be saved.

1 Timothy 1:13

me, I say, who before was a reviler and a persecutor and an overbearing man. But I obtained mercy, because I did it ignorantly in unbelief:

Hebrews 6:4-6

For it is impossible to renew again to repentance those who have once been enlightened, and have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,

Matthew 12:43-45

When the unclean spirit has gone out of a man, he goes through dry places seeking rest, and finds none.

Matthew 12:31-32

Therefore I say to you, That every sin and impious speech shad be forgiven men: but the impious speech against the Spirit shall not be forgiven men.

James 4:17

Therefore, to him that knows how to do good, and does it not, to him it is 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 to renew again to repentance those who have once been enlightened, and have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,
Matthew 12:31
Therefore I say to you, That every sin and impious speech shad be forgiven men: but the impious speech against the Spirit shall not be forgiven men.
John 9:41
Jesus said to them: If you were blind, you would not have sin; but now you say, We see; therefore your sin remains.
1 Timothy 1:13
me, I say, who before was a reviler and a persecutor and an overbearing man. But I obtained mercy, because I did it ignorantly in unbelief:
2 Peter 2:20
For if, after they have escaped the pollutions of the world, through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in these, and overcome by them, the last state of such is worse than the first.
1 John 5:16
If any one see his brother sinning a sin not to death, he shall ask, and he will give him life for those who sin not to death. There is a sin to death: I do not say concerning this, that he should ask.

General references

Matthew 7:27
And the rain descended, and the torrents came, and the winds blew, and beat upon that house, and it fell: and great was its fall.
Matthew 24:21
for then shall be great affliction, such as has not been from the beginning of the world till now, nor shall ever be.
Mark 3:28
Verily I say to you, All sins shall be forgiven the sons of men, and whatever impious speeches they may utter;
Luke 12:10
And whoever shall speak a word against the Son of man, it shall be forgiven him; but he that speaks impiously against the Holy Spirit, shall not be forgiven.