صحيح البخاري
Sahih Bukhari
كتاب الاستسقاء
The Book of Al-Istisqa.
بَابُ رَفْعِ النَّاسِ أَيْدِيَهُمْ مَعَ الإِمَامِ فِي الاِسْتِسْقَاءِ:
(21) Chapter. While offering the Istisqa prayer, people should raise their hands (for invocation) along with the Imam.
Hadith 1030
وَقَالَ الْأُوَيْسِيُّ : حَدَّثَنِي مُحَمَّدُ بْنُ جَعْفَرٍ ، عَنْ يَحْيَى بْنِ سَعِيدٍ وَشَرِيكٍ ، سَمِعَا أَنَسًا ، عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنَّهُ رَفَعَ يَدَيْهِ حَتَّى رَأَيْتُ بَيَاضَ إِبْطَيْهِ .
The narrator Anas added that the Prophet (saws) raised his hands (during the invocation) to such an extent that the whiteness of his armpits was visible.
