'Fours' in the Bible

"'All flying insects that walk on all fours are an abomination to you.

Yet you may eat these: of all winged creeping things that go on all fours, which have legs above their feet, with which to hop on the earth.

Whatever goes on its paws, among all animals that go on all fours, they are unclean to you. Whoever touches their carcass shall be unclean until the evening.

Whatever goes on its belly, and whatever goes on all fours, or whatever has many feet, even all creeping things that creep on the earth, them you shall not eat; for they are an abomination.