Sunan an-Nasa'i 1147

‘Abd al-Rahman ibn Ibrahim—Duhaim—reported to us; he said: Marwan ibn Mu‘awiyah narrated to us; he said: ‘Ubayd Allah ibn ‘Abdullah ibn al-Asamm narrated to us; he said: Yazid ibn al-Asamm narrated to me, from Maymunah, who said: When the Messenger of Allah (ﷺ) prostrated, he spread his arms away from his sides so that the whiteness of his armpits could be seen from behind. When he sat, he settled his weight on his left thigh.