John Wesley on Numbers 11:33

Chewed - Heb. cut off, namely from their mouths. A very great plague - Probably the pestilence. But the sense is, before they had done eating their quails, which lasted for a month. Why did God so sorely punish the peoples murmuring for flesh here, when he spared them after the same sin, Exo 16:12. Because this was a far greater sin, and aggravated with worse circumstances; proceeding not from necessity, as that did, when as yet they had no food, but from mere wantonness, when they had Manna constantly given them; committed after large experience of God's care and kindness, after God had pardoned their former sins, and after God had in a solemn and terrible manner made known his laws to them.