Biblical mourning involved refraining from feasts, songs, and Temple rituals. Amos declared to the people that God would "turn your feasts into mourning, and all your songs into lamentations" as a punishment for sin, describing this mourning as similar to "the mourning for an only son".[9] After two of the sons of Aaron, a High Priest, were killed, Aaron refused to eat the animal sacrifices, saying this would inappropriate at a time he was mourning the sons' death.[10]