279. Etiquette

42:6 If two people or more eat at the same table, even if each has his own plate, it is appropriate to wait for the person of the highest stature to start eating first. One who starts eating before the person of higher stature is considered a glutton.

42:7 If two people are eating from a common plate and one stops eating in order to drink or to attend to some small matter, it is good manners for the other person to wait for him. If there are three diners, the two diners need not wait because of the third.