'Rituals' in the Bible

Ariel is as good as dead -- Ariel, the town David besieged! Keep observing your annual rituals, celebrate your festivals on schedule.

You are to weep in silence, but you are not to participate in mourning rituals. You are to keep your turban on your head and your sandals on your feet. You are not to cover your mouth or eat what your comforters bring to you."