Deuteronomy 14:6
And every beast that parteth the hoof, and cleaveth the cleft into two claws, and cheweth the cud among the beasts, that ye shall eat.
Cross-references
2 Corinthians 6:17
Allusion
In 2 Corinthians 6:17, Paul echoes the call to be separate and touch no unclean thing, directly applying the OT concept.