Every hide is purified by tanning

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "The purification of every hide is in its tanning." I said: O Messenger of Allah! We travel with these non-Arabs who have cooking pots in which they cook carrion and the flesh of swine. He (peace and blessings be upon him) said: "If they are earthenware, boil water in them and then wash them; and if they are of copper, wash them (in the normal way), for water purifies everything."
This hadith has an authentic (sahih) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Sabrah al-Juhani (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) halted at al-Hijr, he said to his Companions: "Whoever has made anything (of food) with this water (of this settlement), let him throw it away." The narrator says: So some of them threw away dough they had kneaded, and some threw away hays (a sweet of dates and butter) they had prepared.
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.