Charles Ellicott Commentary Leviticus 11:43

"Ye shall not make yourselves abominable with any creeping thing that creepeth, neither shall ye make yourselves unclean with them, that ye should be defiled thereby." — Leviticus 11:43 (ASV)

You shall not make yourselves abominable. This refers to eating the unclean creatures, which are constantly characterized in this book as “abominable” (Leviticus 11:10–13; Leviticus 11:20; Leviticus 11:23; Leviticus 11:41–42). This term only occurs twice more in the Hebrew Scriptures (Isaiah 66:17; Ezekiel 8:10). Those who do so render themselves abominable and repulsive; therefore this admonition. The phrase only occurs once more, namely, in Leviticus 20:25, where it is translated in the Authorized Version as, You shall not make your souls abominable. This is the reason why “soul” is indicated in the margin for the word “selves” here.

Neither shall you make yourselves unclean. This means that not only is it disgusting to eat these abominable creatures, but their carcasses also defile and debar anyone who comes into contact with them from entering the sanctuary and from partaking of the sacrificial meal.