Sunan Abu Dawud
4866
Sahih+2

‘Abbad b. Tamim quoted his paternal uncle as saying that he had seen the Messenger of Allah(ﷺ) lying on his back in the mosque according to Qa’nabi’s version) placing one foot over the other

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid