Let every man of whatsoever craft or occupation he be of . . . serve his brethren.

From Joshua 24:14-15:  “Now therefore revere the Lord, and serve Him in sincerity and in faithfulness; put away the gods that your ancestors served beyond the River and in Egypt, and serve the Lord.  Now if you are unwilling to serve the Lord, choose this day whom you will serve, whether the gods your ancestors served in the region beyond the River or the gods of the Amorites in whose land you are living; but as for me and my household, we will serve the Lord.”