Barnes New Testament Notes

Verse 8. Freely ye have received, freely give. That is they were not to sell their favours of healing, preaching, etc. They were not to make a money-making business of it, to bargain specially to heal for so much, and to cast out devils for so much. This, however, neither then nor afterwards precluded them from receiving a competent support. See Lu 10:7; 1 Co 9:8-14; 1 Ti 5:18.

{z} "cast out devils" Ac 8:18,20