Leviticus 5:3, 6, 17

Or if he touches human uncleanness—whatever kind it may be—and he becomes unclean, but he is unaware of it, when he recognizes it, he will be guilty.

He shall bring his guilt offering to the LORD for the sin which he has committed, a female from the flock, a lamb or a goat as a sin offering. So the priest shall make atonement on his behalf for his sin.

“Now if anyone sins and does any of the things which the LORD has forbidden, though he was not aware of it, still he is guilty and shall bear his punishment. [Luke 12:48]