Leviticus 11:27

And every one going upon his hands among all beasts going upon four, they are unclean to you: every one touching upon their carcass shall be unclean till evening.

Leviticus 11:20

All creeping birds going upon four, it is an abomination to you.

Leviticus 11:23

And every creeping bird which to it is four feet, it is abomination to you

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