(160) باب صِفَةِ السُّجُودِ
Maimunah said:
When the Prophet(ﷺ) prostrated himself, he kept his arms so far away from his sides that if a lamb had wanted to pass under his arms, it could have done so.
Reference: Sunan Abi Dawud 898
In-book reference: Book 2, Hadith 508
English translation: Book 2, Hadith 897