It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that in Basrah a black man who was with him narrated some hadiths of the Prophet (peace and blessings be upon him) through Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him). So Ibn Abbas (may Allah be pleased with them both) wrote to him asking about them. Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) wrote to him in reply: "You are indeed the best man of your time (in knowledge). I have not narrated anything about these matters from the Prophet (peace and blessings be upon him), except that I was with the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) wanted to urinate, so he went to a spot of soft earth at the foot of a wall and said: 'Among the Children of Israel, when urine got on one of them, he would cut it off with scissors. So when any of you intends to urinate, let him look for a (soft) spot for his urine.'" This hadith has an authentic (sahih) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Abu Wa'il: I was present with Sayyiduna Abu Musa al-Ash'ari, Ammar bin Yasir and Abu Mas'ud al-Badri (may Allah be pleased with them). I heard Abu Musa and Abu Mas'ud say to Ammar: "Since you accepted Islam, we have not found any matter of yours more disliked by us than your haste in this matter (of the tribulation)." Sayyiduna Ammar (may Allah be pleased with him) replied: "And since you both accepted Islam, I have not disliked anything of yours more than this slowness and delay of yours." Then they all went out together to the mosque.