1 Corinthians 1:17

1:17 For Christ did not send me to baptize, but to preach the gospel – and not with clever speech, so that the cross of Christ would not become useless.

1 Corinthians 6:16

6:16 Or do you not know that anyone who is united with a prostitute is one body with her? For it is said, “The two will become one flesh.”