Leviticus 20:25
Ye shall therefore put difference between clean beasts and unclean, and between unclean fowls and clean: and ye shall not make your souls abominable by beast, or by fowl, or by any manner of living thing that creepeth on the ground, which I have separated from you as unclean.
Cross-references
Leviticus 11 provides the detailed clean/unclean laws that Leviticus 20:25 summarizes and commands to observe.
Leviticus 11:43 repeats the same warning against making oneself abominable through unclean animals.
Leviticus 10:10 commands priests to distinguish holy from unholy — the same foundational distinction applied to animals here.
Deuteronomy 14:3-21 parallels Leviticus 11's dietary laws, reinforcing the clean/unclean distinctions commanded in Leviticus 20:25.
In Acts 10:11-15, God declares all animals clean, directly overturning the clean/unclean distinction commanded here.
Acts 10:28 applies the same clean/unclean concept to people, showing God’s lesson that no person is common.
Ezekiel 22:26 condemns priests for failing to distinguish clean/unclean, directly echoing this command.
Acts 10:14 shows Peter citing this law to refuse eating unclean animals, before the vision reverses it.