وَفِي حَدِيثِ أَبِي حُمَيْدٍ، عِنْدَ أَبِي دَاوُدَ: «يَرْفَعُ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا مَنْكِبَيْهِ، ثُمَّ يُكَبِّرَ» 11 صحيح
Abu Dawud reported a Hadith narrated by Abu Humayd (radiyallahu anhu) to the effect that he used to raise his hands and bring them parallel to his shoulders, and then utter the Takbir.
Bulugh al-Maram 332, Book 2, The Book of Prayer, Hadith 153. 1 min read