John Wesley on Leviticus 5:6

His trespass - offering - But how comes confession and a sacrifice to be necessary for him that touched an unclean thing, when such persons were cleansed with simple washing, as appears from Lev 11:25,28,32,40,43, and Num 19:7,8,10,19? This place speaks of him that being so unclean did come into the tabernacle, as may be gathered by comparing this place with Num 19:13, which if any man did, knowing himself to be unclean, which was the case there, he was to be cut off for it; and if he did it ignorantly, which is the case here, he was upon discovery of it to offer this sacrifice.