The Book of The At-Tatbiq (Clasping One's Hands Together)
12/37. Chapter:
Not raising the hands when prostrating
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ عُبَيْدٍ الْكُوفِيُّ الْمُحَارِبِيُّ، قَالَ حَدَّثَنَا ابْنُ الْمُبَارَكِ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنِ ابْنِ عُمَرَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَرْفَعُ يَدَيْهِ إِذَا افْتَتَحَ الصَّلاَةَ وَإِذَا رَكَعَ وَإِذَا رَفَعَ وَكَانَ لاَ يَفْعَلُ ذَلِكَ فِي السُّجُودِ .
It was narrated that Ibn 'Umar said: "The Messenger of Allah (ﷺ) used to raise his hands when he started to pray, and when he bowed, and when he stood up, but he did not do that when he prostrated."
Reference : Sunan an-Nasa'i 1088In-book reference : Book 12, Hadith 60English translation : Vol. 2, Book 12, Hadith 1089