Hebrews 10:26

For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,

2 Peter 2:20-22

For if, after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first.

1 John 5:16

If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this.

Leviticus 4:2

“Speak to the sons of Israel, saying, ‘If a person sins unintentionally in any of the things which the Lord has commanded not to be done, and commits any of them,

Leviticus 4:13

Now if the whole congregation of Israel commits error and the matter escapes the notice of the assembly, and they commit any of the things which the Lord has commanded not to be done, and they become guilty;

Numbers 15:28-31

The priest shall make atonement before the Lord for the person who goes astray when he sins unintentionally, making atonement for him that he may be forgiven.

Deuteronomy 17:12

The man who acts presumptuously by not listening to the priest who stands there to serve the Lord your God, nor to the judge, that man shall die; thus you shall purge the evil from Israel.

Daniel 5:22-23

Yet you, his son, Belshazzar, have not humbled your heart, even though you knew all this,

Luke 12:47

And that slave who knew his master’s will and did not get ready or act in accord with his will, will receive many lashes,

John 9:41

Jesus said to them, If you were blind, you would have no sin; but since you say, ‘We see,’ your sin remains.

John 13:17

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

John 15:22-24

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

2 Thessalonians 2:10

and with all the deception of wickedness for those who perish, because they did not receive the love of the truth so as to be saved.

1 Timothy 1:13

even though I was formerly a blasphemer and a persecutor and a violent aggressor. Yet I was shown mercy because I acted ignorantly in unbelief;

Hebrews 6:4-6

For in the case of 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

Now when the unclean spirit goes out of a man, it passes through waterless places seeking rest, and does not find it.

Psalm 19:12-13

Who can discern his errors? Acquit me of hidden faults.

Matthew 12:31-32

Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven.

James 4:17

Therefore, to one who knows the right thing to do and does not do it, 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 in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit,
Leviticus 4:2
“Speak to the sons of Israel, saying, ‘If a person sins unintentionally in any of the things which the Lord has commanded not to be done, and commits any of them,
Numbers 15:28
The priest shall make atonement before the Lord for the person who goes astray when he sins unintentionally, making atonement for him that he may be forgiven.
Deuteronomy 17:12
The man who acts presumptuously by not listening to the priest who stands there to serve the Lord your God, nor to the judge, that man shall die; thus you shall purge the evil from Israel.
Psalm 19:12
Who can discern his errors? Acquit me of hidden faults.
Daniel 5:22
Yet you, his son, Belshazzar, have not humbled your heart, even though you knew all this,
Matthew 12:31
Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven.
John 9:41
Jesus said to them, If you were blind, you would have no sin; but since you say, ‘We see,’ your sin remains.
1 Timothy 1:13
even though I was formerly a blasphemer and a persecutor and a violent aggressor. Yet I was shown mercy because I acted ignorantly in unbelief;
2 Peter 2:20
For if, after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first.
1 John 5:16
If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this.

General references

Deuteronomy 18:19
It shall come about that whoever will not listen to My words which he shall speak in My name, I Myself will require it of him.
Matthew 7:27
The rain fell, and the floods came, and the winds blew and slammed against that house; and it fell—and great was its fall.”
Matthew 24:21
For then there will be a great tribulation, such as has not occurred since the beginning of the world until now, nor ever will.
Mark 3:28
Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter;
Luke 12:10
And everyone who speaks a word against the Son of Man, it will be forgiven him; but he who blasphemes against the Holy Spirit, it will not be forgiven him.