'Sinned' in the Bible

The priest is to offer one as a sin offering and the other as a burnt offering to make atonement on behalf of the Nazirite, since he sinned because of the corpse. On that day he must consecrate his head again.

As for the firepans of those who sinned at the cost of their own lives, make them into hammered sheets as plating for the altar, for they presented them before the Lord, and the firepans are holy. They will be a sign to the Israelites.”

The people then came to Moses and said, “We have sinned by speaking against the Lord and against you. Intercede with the Lord so that He will take the snakes away from us.” And Moses interceded for the people.

Balaam said to the Angel of the Lord, “I have sinned, for I did not know that You were standing in the path to confront me. And now, if it is evil in Your sight, I will go back.”