'Abdullah bin Zaid (May Allah be pleased with them) reported:
I saw Messenger of Allah (ﷺ) lying down on his back in the mosque, placing one leg on the other.[Al-Bukhari and Muslim]. (RU)
App reference (RU): Book 5, Hadith 7 (RU)
Arabic/English book reference (RU): Book 5, Hadith 820 (RU)