You are therefore to distinguish between clean and unclean animals and birds. Do not become contaminated by any animal or bird, or by anything that crawls on the ground; I have set these apart as unclean for you.
Jewish Publication Society of America Version (JPS1917) - Leviticus 20:25 >Ye shall therefore separate between the clean beast and the unclean, and between the unclean fowl and the clean; and ye shall not make your souls detestable by beast, or by fowl, or by any thing wherewith the ground teemeth, which I have set apart for you to hold unclean.