Psalms 106:18

Those that will not wait for God's counsel, shall justly be given up to their own hearts' lusts, to walk in their own counsels. An undue desire, even for lawful things, becomes sinful. God showed his displeasure for this. He filled them with uneasiness of mind, terror of conscience, and self-reproach. Many that fare deliciously every day, and whose bodies are healthful, have leanness in their souls: no love to God, no thankfulness, no appetite for the Bread of life, and then the soul must be lean. Those wretchedly forget themselves, that feast their bodies and starve their souls. Even the true believer will see abundant cause to say, It is of the Lord's mercies that I am not consumed. Often have we set up idols in our hearts, cleaved to some forbidden object; so that if a greater than Moses had not stood to turn away the anger of the Lord, we should have been destroyed. If God dealt severely with Moses for unadvised words, what do those deserve who speak many proud and wicked words? It is just in God to remove those relations that are blessings to us, when we are peevish and provoking to them, and grieve their spirits.

And a fire was kindled in their company; the flame burned up the wicked. The Levites who were with Korah perished by fire, which was a most fitting death for those who intruded into the priesthood, and so offered strange fire. God has more than one arrow in his quiver, the fire can consume those whom the earthquake spares. These terrible things in righteousness are mentioned here to show the obstinacy of the people in continuing to rebel against the Lord. Terrors were as much lost upon them as mercies had been; they could neither be drawn nor driven.