Sahih Muslim, 6216

Sa'id b. al-Musayyib reported Abu Musa Ash'ari having said that Allah's Messenger (ﷺ) set out one day to the suburbs of Medina for reliev- ing himself. I followed his steps. The rest of the hadith is the same. Ibn Musayyib said:I concluded (from the manner of their sitting) the (order) of their graves. (The three) would be together (the graves of the Holy Prophet, Hadrat Abu Bakr and Hadrat Umar) and that of 'Uthman would be separate (from them)

Rapporté par Sa’id ibn al-Musayyib رضي الله عنه : Abu Musa al-Ash’ari a rapporté que le Messager d’Allah ﷺ est sorti un jour en périphérie de Médine pour se soulager. Je l’ai suivi. Le reste du hadith est identique. Ibn al-Musayyib a dit : « J’ai compris, en voyant leur manière de s’asseoir, l’ordre de leurs tombes : les trois (le Prophète ﷺ, Abu Bakr et Umar) seraient ensemble, et celle d’Uthman serait séparée des leurs. »