Sunan Abi Dawud
Hadith #4143
Narrated Jabir ibn Samurah: When I came to the Prophet (ﷺ) in his house, I saw him sitting reclining on a pillow. The narrator Ibn al-Jarrah added: ""on his left side"". Abu Dawud said: Ishaq b. Mansur transmitted it from Isra'il, also mentioning the words ""on his left side