Charles H. Spurgeon on Psalms 78:29

So they did eat, and were well filled. They greedily devoured the birds, even to repletion. The Lord shewed them that he could "provide flesh for his people, "even enough and to spare. He also shewed them that when lust wins its desire it is disappointed, and by the way of satiety arrive at distaste. First the food satiates, then it nauseates. For he gave them their own desire. They were filled with their own ways. The flesh meat was unhealthy for them, but as they cried for it they had it, and a curse with it. O my God, deny me my most urgent prayers sooner than answer them in displeasure. Better hunger and thirst after righteousness than to be well filled with sin's dainties.

Verses 30-31. They were not estranged from their lust. Lust grows upon that which it feeds on. If sick of too much flesh, yet men grow not weary of lust, they change the object, and go on lusting still. When one sin is proved to be a bitterness, men do not desist, but pursue another iniquity. If, like Jehu, they turn from Baal, they fall to worshipping the calves of Bethel. But while their meat was yet in their mouths, before they could digest their coveted meat, it turned to their destruction. The wrath of God came upon them before they could swallow their first meal of flesh. Short was the pleasure, sudden was the doom. The festival ended in a funeral. And slew the fattest of them, and smote down the chosen men of Israel. Perhaps these were the ringleaders in the lusting; they are first in the punishment. God's justice has no respect of persons, the strong and the valiant fall as well as the weak and the mean. What they ate on earth they digested in hell, as many have done since. How soon they died, though they felt not the edge of the sword! How terrible was the havoc, though not amid the din of battle! My soul, see here the danger of gratified passions; they are the janitors of hell. When the Lord's people hunger God loves them; Lazarus is his beloved, though he pines upon crumbs; but when he fattens the wicked he abhors them; Dives is hated of heaven when he fares sumptuously every day. We must never dare to judge men's happiness by their tables, the heart is the place to look at. The poorest starveling believer is more to be envied than the most full fleshed of the favourites of the world. Better be God's dog than the devil's darling.