It is narrated from Sayyiduna Abu Ubayy bin Umm Haram (may Allah be pleased with him), who prayed with the Messenger of Allah (peace and blessings be upon him) towards both qiblahs; he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Hold fast to senna and sannut, for in both of them there is healing for every disease except sam." It was asked: O Messenger of Allah, and what is sam? He (peace and blessings be upon him) said: "Death." Ibrahim bin Abi Ablah said: Sannut means shibitt (the herb known as dill). And Amr bin Bakr said that others hold that sannut is the honey that is kept in a waterskin, as the poet said: "They are like ghee with sannut (honey), there is no deceit in them, and they protect their neighbour from being left alone." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.