Charles H. Spurgeon on Psalms 106:17

The earth opened, etc. This element was not used to such morsels. It devours the carcases of men; but bodies informed with living souls, never before. To have seen them struck dead upon the earth had been fearful; but to see the earth at once their executioner and grave, was more horrible. Neither the sea nor the earth are fit to give passage; the sea is moist and flowing, and will not be divided, for the continuity of it; the earth is dry and massy, and will neither yield naturally, nor meet again when it hath yielded: yet the waters did cleave to give way unto Israel for their preservation; the earth did cleave to give way to the conspirators in judgment; both sea and earth did shut their jaws again upon the adversaries of God. There was more wonder in this latter. It was a marvel that the waters opened; it was no wonder that they shut again; for the retiring and flowing was natural. It was no less marvel that the earth opened; but more marvel that it shut again; because it had no natural disposition to meet when it was divided. Now might Israel see they had to do with a God that could revenge with ease. There are two sorts of traitors: the earth swallowed up the one, the fire the other. All the elements agree to serve the vengeance of their Maker. Nadab and Abihu brought fit persons, but unfit fire, to God; these Levites bring the right fire, but unwarranted persons, before him: fire from God consumes both. It is a dangerous thing to usurp sacred functions. The ministry will not grace the man; the man may disgrace the ministry. Joseph Hall.