All fowls that crawl or creep upon the earth, and so degenerate from their proper nature, which is to fly, and are of a mongrel kind; which may intimate that apostates and mongrels in religion are abominable in the sight of God, and in conversation with men. Going upon all four, upon four legs, or upon more than four, as bees, flies, &c, which is all one to the present purpose, these pluralists for legs being here opposed to those that have but two.
Related Commentaries of Leviticus 11:20
Leviticus 11:20
20 All fowls that creep, going upon all four, shall be an abomination unto you.