Leviticus 5:2-3, 6-7, 18-19

“ ‘If anyone becomes aware that they are guilty—if they unwittingly touch anything ceremonially unclean (whether the carcass of an unclean animal, wild or domestic, or of any unclean creature that moves along the ground) and they are unaware that they have become unclean, but then they come to realize their guilt; or if they touch human uncleanness (anything that would make them unclean) even though they are unaware of it, but then they learn of it and realize their guilt

As a penalty for the sin they have committed, they must bring to the LORD a female lamb or goat from the flock as a sin offering; and the priest shall make atonement for them for their sin. “ ‘Anyone who cannot afford a lamb is to bring two doves or two young pigeons to the LORD as a penalty for their sin—one for a sin offering and the other for a burnt offering.

They are to bring to the priest as a guilt offering a ram from the flock, one without defect and of the proper value. In this way the priest will make atonement for them for the wrong they have committed unintentionally, and they will be forgiven. It is a guilt offering; they have been guilty of wrongdoing against the LORD.”