John Lightfoot on Mark 6:3

[Is not this the carpenter?] Among other things to be performed by the father for his son this was one, to bring him up in some art or trade. "It is incumbent on the father to circumcise his son, to redeem him, to teach him the law, and to teach him some occupation. R. Judah saith, 'Whosoever teacheth not his son to do some work, is as if he taught him robbery.'" "R. Meir saith, 'Let a man always endeavour to teach his son an honest art,'" &c. Joseph instructs and brings up Christ in his carpenter's trade.