Jami` at-Tirmidhi Book 47, Hadith 349
“Abu Bakr said: ‘O Messenger of Allah! You have become gray.’ He said: ‘I have gone gray from (Surat) Hud, Al-Waqi`ah, Al-Mursalat and `Amma Yatasa'alun and Idhash-Shamsu Kuwwirat.’”
“The Messenger of Allah recited: Verily, We have created them a special creation. He said: “Among that special creation is the women who were decrepit, bleary eyed and elderly in the world.”
Abu Hurairah said: “Once when the Prophet of Allah was sitting with his Companions, a cloud came above them, so the Prophet of Allah said: ‘Do you know what this is?’ They said: ‘Allah and His Messenger know better.’ He said: ‘These are the clouds that are to drench the earth, which Allah down with a rope to the lowest earth, then he would descend upon Allah.’ Then he recited: He is Al-Awwal, Al-Akhir, Az-Zahir Al-Batin, and He has knowledge over all things.”