William Burkitt on Matthew 10:8

Here our Saviour empowers his apostles to work miracles for the confirmation of their doctrine; but gives them a charge to work them freely, without making any private advantage to themselves.

Where observe, 1. How beneficial the miracles were (which Christ and his apostles wrought) to mankind. Moses' miracles were as great judgments as wonders; but these were beneficent, they delivered men from miseries, from bodily diseases, from the power and malice of evil spirits; they healed the sick, and cast out devils.

Observe, 2. That Jesus Christ, to show himself a free Saviour, and that whatever came from him was the effect of free grace, gave his apostles a charge to dispense their power in working miracles freely, without money, and without price.