Hebrews 10:26

For [if] we keep on sinning deliberately 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 from the defilements of the world through the knowledge of the Lord and Savior Jesus Christ, and they are again entangled in these [things] [and] succumb to [them], the last [state] has become worse for them than the first.

1 John 5:16

If anyone should see his brother sinning a sin not [leading] to death, he should ask, and he will grant life to him, to those who sin not [leading] to death. ([There] is a sin [leading] to death; I do not say that he should ask about that.

Leviticus 4:2

"Speak to the {Israelites}, saying, 'If a person sins by an unintentional wrong from any of Yahweh's commands that should not be {violated}, and he {violates} {any of them}--

Leviticus 4:13

" 'If Israel's whole assembly did wrong unintentionally and the matter was concealed from the assembly's eyes, and they acted [against] {any of} Yahweh's commands that should not be {violated}, so that they incur guilt,

Numbers 15:28-31

And the priest will make atonement for the person who {sinned unintentionally} {before Yahweh}, to make atonement for him, and he will be forgiven.

Deuteronomy 17:12

And the man who treats with contempt [so as] not to listen to the priest [who] [is] standing to minister on behalf of Yahweh your God or to the judge, that man shall die; so you shall purge the evil from Israel.

Daniel 5:22-23

"But you his {successor}, Belshazzar, have not humbled your heart {even though} you knew all this.

Luke 12:47

And that slave who knew the will of his master and did not prepare or do according to his will {will be given a severe beating}.

John 9:41

Jesus said to them, "If you were blind, you would not have sin. But now you say, 'We see,' your sin remains.

John 13:17

If you understand 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 do not have a valid excuse for their sin.

2 Thessalonians 2:10

and with every unrighteous deception against those who are perishing, in place of which they did not accept the love of the truth, so that they would be saved.

1 Timothy 1:13

[although I] was formerly a blasphemer and a persecutor and a violent man, but I was shown mercy because I acted ignorantly in unbelief,

Hebrews 6:4-6

For [it is] impossible [concerning] those who have once been enlightened, and have tasted the heavenly gift, and become sharers of the Holy Spirit,

Matthew 12:43-45

"Now whenever an unclean spirit has gone out of a person, it travels through waterless places searching for rest, and does not find [it].

Psalm 19:12-13

Who can perceive [his] errors? Acquit me from hidden [faults].

Matthew 12:31-32

For this [reason] I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven!

James 4:17

Therefore, to the one who knows to do good 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 [it is] impossible [concerning] those who have once been enlightened, and have tasted the heavenly gift, and become sharers of the Holy Spirit,
Leviticus 4:2
"Speak to the {Israelites}, saying, 'If a person sins by an unintentional wrong from any of Yahweh's commands that should not be {violated}, and he {violates} {any of them}--
Numbers 15:28
And the priest will make atonement for the person who {sinned unintentionally} {before Yahweh}, to make atonement for him, and he will be forgiven.
Deuteronomy 17:12
And the man who treats with contempt [so as] not to listen to the priest [who] [is] standing to minister on behalf of Yahweh your God or to the judge, that man shall die; so you shall purge the evil from Israel.
Psalm 19:12
Who can perceive [his] errors? Acquit me from hidden [faults].
Daniel 5:22
"But you his {successor}, Belshazzar, have not humbled your heart {even though} you knew all this.
Matthew 12:31
For this [reason] I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven!
John 9:41
Jesus said to them, "If you were blind, you would not have sin. But now you say, 'We see,' your sin remains.
1 Timothy 1:13
[although I] was formerly a blasphemer and a persecutor and a violent man, but I was shown mercy because I acted ignorantly in unbelief,
2 Peter 2:20
For if, [after they] have escaped from the defilements of the world through the knowledge of the Lord and Savior Jesus Christ, and they are again entangled in these [things] [and] succumb to [them], the last [state] has become worse for them than the first.
1 John 5:16
If anyone should see his brother sinning a sin not [leading] to death, he should ask, and he will grant life to him, to those who sin not [leading] to death. ([There] is a sin [leading] to death; I do not say that he should ask about that.

General references

Deuteronomy 18:19
{And then} the man that will not listen to my words that he shall speak in my name, I will hold accountable.
Matthew 7:27
And the rain came down and the rivers came and the winds blew and beat against that house, and it collapsed, and its fall was great."
Matthew 24:21
For at that time there will be great tribulation, such as has not happened from the beginning of the world until now, nor ever will happen.
Mark 3:28
"Truly I say to you that all the sins and the blasphemies will be forgiven the sons of men, however much they blaspheme.
Luke 12:10
And everyone who speaks a word against the Son of Man, it will be forgiven him, but to the one who blasphemes against the Holy Spirit, it will not be forgiven.