21 Yet these may ye eat of every flying creeping thing that goeth upon all four, which have legs above their feet, to leap withal upon the earth;
English Standard Version
21 Yet among the winged insects that go on all fours you may eat those that have jointed legs above their feet, with which to hop on the ground.
21 But you can eat some of these, namely, those that have jointed legs for hopping on the ground:
New King James Version
21 Yet these you may eat of every flying insect that creeps on all fours: those which have jointed legs above their feet with which to leap on the earth.
New Living Translation
21 You may, however, eat winged insects that walk along the ground and have jointed legs so they can jump.
Matthew Henry's Commentary on Leviticus 11:21
What animals were clean and unclean.
These laws seem to have been intended, 1. As a test of the people's obedience, as Adam was forbidden to eat of the tree of knowledge; and to teach them self-denial, and the government of their appetites. 2. To keep the Israelites distinct from other nations. Many also of these forbidden animals were objects of superstition and idolatry to the heathen. 3. The people were taught to make distinctions between the holy and unholy in their companions and intimate connexions. 4. The law forbad, not only the eating of the unclean beasts, but the touching of them. Those who would be kept from any sin, must be careful to avoid all temptations to it, or coming near it. The exceptions are very minute, and all were designed to call forth constant care and exactness in their obedience; and to teach us to obey. Whilst we enjoy our Christian liberty, and are free from such burdensome observances, we must be careful not to abuse our liberty. For the Lord hath redeemed and called his people, that they may be holy, even as he is holy. We must come out, and be separate from the world; we must leave the company of the ungodly, and all needless connexions with those who are dead in sin; we must be zealous of good works devoted followers of God, and companions of his people.