Jerome — as excerpted in the Catena Aurea on Matthew 10:5-8

“And because spiritual gifts are more lightly esteemed when money is made the means of obtaining them, He adds a condemnation of avarice; Freely ye have received, freely give; I your Master and Lord have imparted these to you without price, do you therefore give them to others in like manner, that the free grace of the Gospel be not corrupted.”