Know ye not ... - This is the third argument against licentiousness. It is, that we as Christians are united to Christ (compare the notes at John 15:1 ff); and that it is abominable to take the members of Christ and subject them to pollution and sin. Christ was pure - wholly pure. We are professedly united to him. We are bound therefore to be pure, as he was. Shall that which is a part, as it were, of the pure and holy Saviour, be prostituted to impure and unholy embraces?
God forbid! - See the note at Romans 3:4. This expresses the deep abhorrence of the apostle at the thought. It needed not argument to show it. The whole world revolted at the idea; and language could scarcely express the abomination of the very thought.
Know ye not ... - This is designed to confirm and strengthen what he had just said.
He which is joined - Who is attached to; or who is connected with.
Is one body - That is, is to he regarded as one; is closely and intimately united. Similar expressions occur in Classic writers. See Grotius and Bloomfield.
For two, saith he ... - This Paul illustrates by a reference to the formation of the marriage connection in Ger. Romans 2:14. He cannot be understood as affirming that that passage had original reference to illicit connections; but be uses it for purposes of illustration. God had declared that the man and his wife became one; in a similar sense in unlawful connections the parties became one.