8 Bible Verses about Sins Of Omission

The Lord spoke to Moses: “Say to the Israelites: Any Israelite or foreigner living in Israel who gives any of his children to Molech must be put to death; the people of the country are to stone him. I will turn against that man and cut him off from his people, because he gave his offspring to Molech, defiling My sanctuary and profaning My holy name. read more.
But if the people of the country look the other way when that man gives any of his children to Molech, and do not put him to death, then I will turn against that man and his family, and cut off from their people both him and all who follow him in prostituting themselves with Molech.

Rescue those being taken off to death,
and save those stumbling toward slaughter.
If you say, “But we didn’t know about this,”
won’t He who weighs hearts consider it?
Won’t He who protects your life know?
Won’t He repay a person according to his work?

But be doers of the word and not hearers only, deceiving yourselves. Because if anyone is a hearer of the word and not a doer, he is like a man looking at his own face in a mirror. For he looks at himself, goes away, and immediately forgets what kind of man he was. read more.
But the one who looks intently into the perfect law of freedom and perseveres in it, and is not a forgetful hearer but one who does good works—this person will be blessed in what he does.

So it is a sin for the person who knows to do what is good and doesn’t do it.

“Woe to you, scribes and Pharisees, hypocrites! You pay a tenth of mint, dill, and cumin, yet you have neglected the more important matters of the law—justice, mercy, and faith. These things should have been done without neglecting the others.

“Then He will answer them, ‘I assure you: Whatever you did not do for one of the least of these, you did not do for Me either.’

“But woe to you Pharisees! You give a tenth of mint, rue, and every kind of herb, and you bypass justice and love for God. These things you should have done without neglecting the others.

And that slave who knew his master’s will and didn’t prepare himself or do it will be severely beaten.