Charles H. Spurgeon on Psalms 106:17

The earth opened and swallowed up Dathan, and covered the company of Abiram. Korah is not mentioned, for mercy was extended to his household, though he himself perished. The earth could no longer bear up under the weight of these rebels and ingrates: God's patience was exhausted when they began to assail his servants, for his children are very dear to him, and he that toucheth them touches the apple of his eye. Moses had opened the sea for their deliverance, and now that they provoke him, the earth opens for their destruction. It was time that the nakedness of their sins was covered, and that the earth should open her mouth to devour those who opened their mouths against the Lord and his servants.