It wasnarrated that 'Umair bin Habib said:
"The Messenger of Allah(ﷺ) used to raise his hands at every Takbir (saying Allahu Akbar)inthe obligatory prayer." (JA)
English reference (JA): Vol. 1, Book 5, Hadith 861 (JA)
Arabic reference (JA): Book 5, Hadith 910 (JA)