John Calvin on Exodus 16:13

13. And it came to pass. We shall afterwards see, that, when from weariness of the manna they began to desire meat, quails were again given them; but, while they were yet in their mouths, a terrible punishment was inflicted upon their gluttony. When here they had only complained of their want of food, God for once satiated them with flesh, that He might show them that He has in His hand all kinds and quantity of meats. Yet, it was His will that they should be content with one single sort; for, although they had complained that they were deprived of flesh, at the pots of which they had formerly sat, yet it was not reasonable that He should comply altogether with their unholy desires. Besides, it was profitable for them that certain bounds should be set, that they might learn dependence on His will.