Bulugh al-Maram 2 The Book of Prayer كتاب الصلاة 153

وَفِي حَدِيثِ أَبِي حُمَيْدٍ , عِنْدَ أَبِي دَاوُدَ : { يَرْفَعُ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا مَنْكِبَيْهِ, ثُمَّ يُكَبِّرَ } 1 1 – صحيح . رواه أبو داود (730) .

Abu Dawud reported a Hadith narrated by Abu Humaid (RA) to the effect that he [Allah’s Messenger (صلى الله عليه وسلم)] used to raise his hands and bring them parallel to his shoulders, and then utter the Takbir.