Charles Ellicott Commentary Leviticus 20:25

"Ye shall therefore make a distinction between the clean beast and the unclean, and between the unclean fowl and the clean: and ye shall not make your souls abominable by beast, or by bird, or by anything wherewith the ground teemeth, which I have separated from you as unclean." — Leviticus 20:25 (ASV)

Ye shall therefore put difference. —Better, You shall therefore separate. It is the same word which is used at the end of the preceding verse, and which is rendered “separate” in the Authorized Version.

It is important that the word should be translated by the same expression, since it not only shows the intimate connection between the two verses, but more forcibly brings out the reason for the exhortation in the verse before us.

Because the Lord has separated or distinguished the Israelites from all nations and is about to give them the promised land, therefore the Israelites are to separate or distinguish between the clean and unclean animals, as ordained in Leviticus 11:0.

By strictly following the dietary laws, the Israelites will always be able to keep separate from all other nations (Daniel 1:8).