Commentary for Kiddushin 132:4

R. Tarfon and R. Akiva now muster other comparisons—the case of a priest who was serving in the Temple and discovered to be unfit either because his mother was not fit to marry a priest or because he has a blemish. If it was discovered that his mother was not fit because she was a divorcee or a halutzah, then his earlier service is not disqualified. But if it is discovered that he has a blemish, his earlier service is unfit.