Deuteronomy 14:21

Deu 14:21 Ye shall not eat [of] any thing that dieth of itself: thou shalt give it unto the stranger that [is] in thy gates, that he may eat it; or thou mayest sell it unto an alien: for thou [art] an holy people unto the LORD thy God. Thou shalt not seethe a kid in his mother’s milk.

Ver. 21. Thou shalt not seethe, ] See Trapp on " Exo 23:19 "