عَنْ قَتَادَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ أَنَسًا حَدَّثَهُمْ قَالَ لَمْ يَكُنْ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنْ دُعَائِهِ وَقَالَ يَحْيَى مَرَّةً مِنَ الدُّعَاءِ إِلَّا فِي الِاسْتِسْقَاءِ فَإِنَّهُ كَانَ يَرْفَعُ يَدَيْهِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ
Sayyiduna Anas (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) would not raise his hands in any supplication, except when asking for rain. On that occasion, he (peace and blessings be upon him) would raise his hands so much that the whiteness of his armpits would become visible.