John Calvin Commentary 1 Corinthians 3:23

"and ye are Christ`s; and Christ is God`s." — 1 Corinthians 3:23 (ASV)

Christ is God’s. This subjection relates to Christ’s humanity, for by taking upon himself our flesh, he assumed the form of a servant and the condition of a servant, that he might make himself obedient to his Father in all things (Philippians 2:7–8).

And assuredly, that we may hold fast to God through him, it is necessary that he have God as his head (1 Corinthians 11:3).

We must observe, however, with what intention Paul has added this. For he admonishes us that the sum of our blessedness consists in this: that we are united to God, who is the chief good. This is accomplished when we are gathered together under the head that our heavenly Father has set over us. In the same sense, Christ said to his disciples:

You ought to rejoice, because I go to the Father,
for the Father is greater than I (John 14:28).

For there he presented himself as the means through which believers come to the original source of every blessing. It is certain that those who depart from the unity of the Head are left deprived of that significant blessing. Hence, this order of things fits the context of the passage—that those who desire to remain under God’s jurisdiction subject themselves to Christ alone.