Bede the Venerable

But some one may ask how this injunction agrees with the word of the Apostle, which says, Beloved, serve one another. (Gal. 5:13.) In the Greek, δουλεία signifies a common service, (i. e. given either to God or man,) according to which we are bid to serve one another; but λατρεία is the service due to the worship of the Deity, with which we are bid to serve God alone.