He afterwards adds, That they may serve him with one shoulder; that is, that they may unitedly submit to God in order to do him service; for to serve him with the shoulder is to unite together, so as to help one another. The metaphor seems to have been derived from those who carry a burden; for except each assists, one will be overpowered, and then the burden will fall to
the ground. We are said then to serve God with one shoulder when we strive by mutual consent to assist one another. And this ought to be carefully noticed, that we may know that our striving cannot be approved by God, except we have thus the same end in view, and seek also to add courage to others, and mutually to help one another. Unless then the faithful thus render mutual assistance, the Lord cannot approve of their service.
The expression “with one shoulder” is rendered by the Septuagint, “under one yoke”—ὑπὸ ζυγὸν ἕνα. The idea is that of oxen drawing together. To serve God under one yoke, is to do the same service unitedly. “A metaphor,” says Newcome, “from the joint efforts of yoked beasts.”—Ed.