Leviticus 22:11

But if the priest buy any soul with his money, he shall eat of it, and he that is born in his house: they shall eat of his meat.

Cross-reference

Numbers 18:11-13 further specifies that all clean members of the priest's household may eat the offerings — including the slaves mentioned in Leviticus 22:11.

Genesis 17:13 uses the same categories—those born in the house or bought—to define who must be circumcised under the covenant, paralleling the priest's household slaves who may eat holy food.