Muslim

Anas reported: The Messenger of Allah (ﷺ) said: Observe moderation in prostration, and let none of you stretch out his forearms (on the ground) like a dog.

This hadith has been narrated by Shu'bah with the same chain of transmitters. And in the hadith transmitted by Ibn Ja'far (the words are):" None of you should stretch out his forearms like the stretching out of a dog."

Al-Bira' (b. 'Azib) reported: The Messenger of Allah (ﷺ) said. When you prostrate yourself, place the palms of your hands on the ground and raise your elbows.

'Abdullah bin Malik ibn Bujainah reported: When the Prophet (ﷺ) prostrated, he spread out his arms so that the whiteness of his armpits was visible.

This hadith has been narrated by Ja'far bin Rabi' with the same chain of transmitters. And in the narration transmitted by 'Amr bin al-Harith (the words are): "When the Messenger of Allah (ﷺ) prostrated, he spread out his arms so that the whiteness of his armpits was visible." And in the narration transmitted by al-Laith (the words are: "When the Messenger of Allah (ﷺ) prostrated, he spread his hands from the armpits so that I saw their whiteness."

Maimuna reported: When the Apostle of Allah (ﷺ) prostrated himself, if a lamb wanted to pass between his arms, it could pass.

Maimuna, the wife of the Apostle of Allah (ﷺ) , reported: When the Messenger of Allah (ﷺ) prostrated himself, he spread his arms, i. e. he separated them so much that the whiteness of his armpits became visible from behind and when he sat (for Jalsa) he rested on his left thigh.

Maimuna daughter of Harith reported: When the Messenger of Allah (ﷺ) prostrated, he kept his hands so much apart from each other that when it was seen from behind the armpits became visible. Waki' said: That is their whiteness.