376 — Muhammad ibn Idrīs narrated to us: Asbagh narrated to us: Ibn Wahb informed me: Abd Allah ibn Ayyāsh informed me, from Yazīd ibn Qawdhar, from Ka'b—may Allah be pleased with him—who said: “Whoever curses someone without just cause, that curse will continue to pass back and forth between heaven and earth until it settles upon the collarbone of the one who uttered it.”