Sayyiduna Abdullah bin Ja'far (may Allah be pleased with them both) narrates that the Messenger of Allah (peace be upon him) liked to conceal himself behind a mound or a cluster of date palms when relieving himself. Imam Abu Bakr (may Allah have mercy on him) says: I heard Muhammad bin Aban saying (he says): I heard Ibn Idris saying, I asked Shu'bah, "What do you say about Mahdi bin Maymun?" He replied, "(He is) trustworthy (narrator)." I said, "He narrated to me from Salm Alawi, who says: I saw Aban bin Abu Ayyash writing on a tablet in the presence of Sayyiduna Anas bin Malik (may Allah be pleased with him)." Mahdi says: Salm Alawi is the one who used to sight the moon before the people. Imam Abu Bakr (may Allah have mercy on him) says: Muhammad bin Abu Ya'qub is Muhammad bin Allah bin Abu Ya'qub. He (Muhammad) is attributed to his grandfather (Abu Ya'qub), meaning instead of calling him Muhammad bin Abdullah, he is called Muhammad bin Abu Ya'qub. Shu'bah says about his (grandfather): Muhammad bin Abu Ya'qub narrated to me, who is the chief of Banu Tamim (i.e., Abu Ya'qub).