Reference for Chullin 161:38

אין מלקות אותו ואת בנו נוהג בקדשים

Raba also said: If the dam was an Unconsecrated animal and the young a burnt-offering, it goes without saying that if a man first slaughtered the unconsecrated animal and later [on the same day] the burnt-offering, he is not culpable;

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