Leviticus 20:25-26
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25You are therefore to make a distinction between the clean animal and the unclean, and between the unclean bird and the clean; and you shall not make yourselves detestable by animal or by bird, or by anything that crawls on the ground, which I have distinguished for you as unclean. 26So you are to be holy to Me, for I the Lord am holy; and I have singled you out from the peoples to be Mine.