John Calvin Commentary 1 Corinthians 10:26

"for the earth is the Lord`s, and the fulness thereof." — 1 Corinthians 10:26 (ASV)

The earth is the Lord’s; he establishes, from the testimony of David, the liberty which he had allowed (Psalms 24:1 and Psalm 50:12). But it will be asked by someone, “What has this to do with the point?” I answer, if the fullness of the earth is the Lord’s, there is nothing in the world that is not sacred and pure. We must always keep in view the question the Apostle addresses. It might be doubted whether the creatures of God were polluted by the sacrifices of the wicked. Paul says they are not, since the rule and possession of the whole earth always remain in the hands of God. Now, whatever things the Lord has in his hands, he preserves by his power and consequently sanctifies them. The sons of God, therefore, have the pure use of everything, because they receive them in no other way than from the hand of God.

The fullness of the earth is an expression that the Prophet uses to denote the abundance of blessings with which the earth is furnished and adorned by the Lord. For if the earth were stripped of trees, herbs, animals, and other things, it would be like a house devoid of furniture and every kind of utensil; indeed, it would be mutilated and disfigured. Should anyone object that the earth is cursed on account of sin, the answer is easy—that he is referring to its pure and perfect nature, because Paul is speaking of believers, to whom all things are sanctified through Christ.