Sahih Muslim 897
Sahih Muslim · Book 9: The Book of Prayer - Rain · The Supplication When Praying For Rain
'Ubaidullah b. Anas b. Malik heard (his father) Anas b. Malik as saying:
وَحَدَّثَنَا هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ ، حَدَّثَنَا ابْنُ وَهْبٍ ، حَدَّثَنِي أُسَامَةُ ، أَنَّ حَفْصَ بْنَ، عُبَيْدِ اللَّهِ بْنِ أَنَسِ بْنِ مَالِكٍ حَدَّثَهُ أَنَّهُ، سَمِعَ أَنَسَ بْنَ مَالِكٍ ، يَقُولُ جَاءَ أَعْرَابِيٌّ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم يَوْمَ الْجُمُعَةِ وَهُوَ عَلَى الْمِنْبَرِ . وَاقْتَصَّ الْحَدِيثَ وَزَادَ فَرَأَيْتُ السَّحَابَ يَتَمَزَّقُ كَأَنَّهُ الْمُلاَءُ حِينَ تُطْوَى .
A bedouin came to the Messenger of Allah (ﷺ) on Friday as he was (delivering the sermon on his) pulpit; and the rest of the hadith is the same but with this addition:" I saw the cloud clearing just as a sheet is folded."