John Wesley on Numbers 11:18

Sanctify themselves - Prepare to meet thy God, O Israel, in the way of his judgments. 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, your souls may be saved from the wrath of God. Sanctifying is often used for preparing, as Jer 6:4 12:3. In the ears of the Lord - Not secretly in your closets, but openly and impudently in the doors of your tents, calling heaven and earth to witness.