Muwatta Malik · Hadith 164
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَرْفَعُ يَدَيْهِ فِي الصَّلاَةِ .
Yahya related to me from Malik from Yahya ibn Sa'id from Sulayman ibn Yasar that the Messenger of Allah, may Allah bless him and grant him peace, used to raise his hands in the prayer
Sahih · Salim al-Hilali