(160) باب صِفَةِ السُّجُودِ
Abu Hurairah reported the Prophet(ﷺ) as saying:
when one of you prostrates himself, he should not stretch out his forearms( on the ground) like a dog and he should join both of his thighs.
Reference: Sunan Abi Dawud 901
In-book reference: Book 2, Hadith 511
English translation: Book 2, Hadith 900