Sayyiduna al-Asla' bin Sharik (may Allah be pleased with him) said: I used to saddle the she-camel of the Messenger of Allah (peace and blessings be upon him). On a cold night I became in a state of major ritual impurity (janabah), and the Messenger of Allah (peace and blessings be upon him) wanted to set off. I disliked saddling his she-camel (peace and blessings be upon him) while in a state of janabah, and I also feared that if I bathed with cold water I would die or fall ill. So I asked a man from the Ansar to saddle it, and I placed some stones and heated water with them and bathed. Then I caught up with the Messenger of Allah (peace and blessings be upon him) and his Companions, and he (peace and blessings be upon him) said: "O Asla', why do I see that your saddling has changed?" I said: O Messenger of Allah, I did not saddle it; a man from the Ansar saddled it. He (peace and blessings be upon him) asked: "Why?" I said: I was in a state of janabah and feared the cold for myself, so I asked him to saddle it, and I placed some stones, heated water and bathed with it. Thereupon Allah Almighty revealed this verse: "O you who believe, do not approach prayer while you are intoxicated" up to "Indeed Allah is Ever-Pardoning, Most Forgiving." [Surah al-Nisa: 43]
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 873