1 Corinthians 7:35

7:35 I am saying this for your benefit, not to place a limitation on you, but so that without distraction you may give notable and constant service to the Lord.

1 Corinthians 9:18

9:18 What then is my reward? That when I preach the gospel I may offer the gospel free of charge, and so not make full use of my rights in the gospel.