عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَمُدُّ يَدَيْهِ حَتَّى إِنِّي لَأَرَى بَيَاضَ إِبْطَيْهِ وَقَالَ سُلَيْمَانُ يَعْنِي فِي الِاسْتِسْقَاءِ
It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, who says: I saw the Messenger of Allah, peace and blessings be upon him, he stretched his hands so much that I could see the whiteness of his armpits. The narrator Sulaiman said: The Prophet, peace and blessings be upon him, was supplicating for rain at that time.