(118) باب رَفْعِ الْيَدَيْنِ فِي الصَّلاَةِ
Wa'il b.Hujr said:
He saw that when the Prophet(ﷺ) stood up to pray he raised his hands till they were in front of his shoulders and placed his thumbs opposite his ears; then he uttered the Takbir (Allah is most great).
Reference: Sunan Abi Dawud 724
In-book reference: Book 2, Hadith 334
English translation: Book 2, Hadith 723