Hebrews 10:26

For where we sin wilfully after receiving the knowledge of the truth, there no longer remains any sacrifice for sins,

2 Peter 2:20-22

For if after having escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, again entangled, they are subdued by these, their last state is worse than the first.

1 John 5:16

If any one see his brother sinning a sin not unto death, he shall ask, and he shall give him life, for those that do not sin unto death. There is a sin to death: I do not say of that that he should make a request.

Leviticus 4:2

Speak unto the children of Israel, saying, If a soul shall sin through inadvertence against any of the commandments of Jehovah in things that ought not to be done, and do any of them;

Leviticus 4:13

And if the whole assembly of Israel sin inadvertently, and the thing be hid from the eyes of the congregation, and they do somewhat against any of all the commandments of Jehovah in things which should not be done, and are guilty;

Numbers 15:28-31

And the priest shall make atonement for the soul that hath done inadvertently, when he sinneth by inadvertence before Jehovah, to make atonement for him; and it shall be forgiven him.

Deuteronomy 17:12

And the man that shall act presumptuously, and not hearken unto the priest that standeth to serve there before Jehovah thy God, or unto the judge, that man shall die; and thou shalt put away evil from Israel.

Daniel 5:22-23

And thou, Belshazzar, his son, hast not humbled thy heart, although thou knewest all this;

Luke 12:47

But that bondman who knew his own lord's will, and had not prepared himself nor done his will, shall be beaten with many stripes;

John 9:41

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

John 13:17

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

John 15:22-24

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

2 Thessalonians 2:10

and in all deceit of unrighteousness to them that perish, because they have not received the love of the truth that they might be saved.

1 Timothy 1:13

who before was a blasphemer and persecutor, and an insolent overbearing man: but mercy was shewn me because I did it ignorantly, in unbelief.

Hebrews 6:4-6

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

Matthew 12:43-45

But when the unclean spirit has gone out of the man, he goes through dry places, seeking rest, and does not find it.

Psalm 19:12-13

Who understandeth his errors? Purify me from secret faults.

Matthew 12:31-32

For this reason I say unto you, Every sin and injurious speaking shall be forgiven to men, but speaking injuriously of the Spirit shall not be forgiven to men.

James 4:17

To him therefore who 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 once enlightened, and who have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,
Leviticus 4:2
Speak unto the children of Israel, saying, If a soul shall sin through inadvertence against any of the commandments of Jehovah in things that ought not to be done, and do any of them;
Numbers 15:28
And the priest shall make atonement for the soul that hath done inadvertently, when he sinneth by inadvertence before Jehovah, to make atonement for him; and it shall be forgiven him.
Deuteronomy 17:12
And the man that shall act presumptuously, and not hearken unto the priest that standeth to serve there before Jehovah thy God, or unto the judge, that man shall die; and thou shalt put away evil from Israel.
Psalm 19:12
Who understandeth his errors? Purify me from secret faults.
Daniel 5:22
And thou, Belshazzar, his son, hast not humbled thy heart, although thou knewest all this;
Matthew 12:31
For this reason I say unto you, Every sin and injurious speaking shall be forgiven to men, but speaking injuriously of the Spirit shall not be forgiven to men.
John 9:41
Jesus said to them, If ye were blind ye would not have sin; but now ye say, We see, your sin remains.
1 Timothy 1:13
who before was a blasphemer and persecutor, and an insolent overbearing man: but mercy was shewn me because I did it ignorantly, in unbelief.
2 Peter 2:20
For if after having escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, again entangled, they are subdued by these, their last state is worse than the first.
1 John 5:16
If any one see his brother sinning a sin not unto death, he shall ask, and he shall give him life, for those that do not sin unto death. There is a sin to death: I do not say of that that he should make a request.

General references

Deuteronomy 18:19
And it shall come to pass that the man who hearkeneth not unto my words which he shall speak in my name, I will require it of him.
Matthew 7:27
and the rain came down, and the streams came, and the winds blew and beat upon that house, and it fell, and its fall was great.
Matthew 24:21
for then shall there be great tribulation, such as has not been from the beginning of the world until now, nor ever shall be;
Mark 3:28
Verily I say unto you, that all sins shall be forgiven to the sons of men, and all the injurious speeches with which they may speak injuriously;
Luke 12:10
and whoever shall say a word against the Son of man it shall be forgiven him; but to him that speaks injuriously against the Holy Spirit it shall not be forgiven.