Sanctify yourselves, i.e. prepare yourselves, either to receive the miraculous blessings of God, the flesh you desire; or rather, Prepare to meet thy God, O Israel, in the way of his judgments, and to receive the punishment which God will inflict upon you; for it is evident, from Numbers 18:20, that God answered them with a curse instead of a blessing. Prepare yourselves by true repentance, that you may either obtain some mitigation of the plague, or, whilst your bodies are destroyed by the flesh you desire and eat, Numbers 11:33,34, your souls may be saved from the wrath of God. Sanctifying is oft used for preparing, as Jeremiah 6:4, Jeremiah 12:3 51:28. In the ears of the Lord; not secretly in your closets, but openly and impudently in the doors of your tents, Numbers 11:10, calling heaven and earth to witness your cries and complaints.
Related Commentaries of Numbers 11:18
Numbers 11:18
18 And say thou unto the people, Sanctify yourselves against to morrow, and ye shall eat flesh: for ye have wept in the ears of the LORD, saying, Who shall give us flesh to eat? for it was well with us in Egypt: therefore the LORD will give you flesh, and ye shall eat.