"al-Aḥādīth al-Mukhtārah" (1/407) from various chains from al-Ḥasan, from ʿUtay ibn Ḍumrah al-Saʿdī, from Ubayy ibn Kaʿb, that he heard a man say: "O so-and-so!" So he said to him: "Bite your father's male organ," and it was not, so he said to him: "O Abū al-Mundhir, you were not obscene," he replied: "I heard the Messenger of Allāh (ṣallá Allāhu ʿalayhi wa-sallam) say:" and he mentioned it. I said: This isnād [chain of transmission] has trustworthy men, so it is authentic if al-Ḥasan heard it from ʿUtay ibn Ḍumrah, for he was a mudallis and has narrated it with ʿanʿanah [using "from" ambiguously]. Ibn al-Sunnī also narrated it (427) through the route of Saʿīd ibn Bashīr, from Qatādah, from al-Ḥasan, from Makhūl, from ʿAjr ibn Madraʿ al-Tamīmī who said: "O family of Tamīm"—and he was from Banū Tamīm, and he said this while with Ubayy ibn Kaʿb—so Ubayy said: "May Allāh make you bite your father's male organ." The ḥadīth is similar. This is contrary to the first isnād, and that one is more authentic because this one includes Saʿīd ibn Bashīr, who is weak, and he may have erred in it; otherwise, al-Ḥasan would have two isnāds from Ubayy. I have found another isnād for the ḥadīth from Ubayy. ʿAbd Allāh ibn Aḥmad said (5/133): Muḥammad ibn ʿAmr ibn al-ʿAbbās al-Bāhilī narrated to us, Sufyān narrated to us, from ʿĀṣim, from Abū ʿUthmān, from Ubayy (raḍiya Allāhu ʿanhu) that a man claimed lineage, so Ubayy made him bite his father's male organ, and they said: "You were not obscene," he said: "We were commanded to do so." Through the route of ʿAbd Allāh, al-Ḍiyāʾ narrated it in "al-Mukhtārah" (1/405). I said: This isnād is authentic; all its men are trustworthy, the men of the two Shaykhs, except for Muḥammad ibn ʿAmr, who is trustworthy as Abū Dāwūd and others said, and ʿĀṣim is Ibn Sulaymān al-Aḥwal, and Sufyān is Ibn ʿUyaynah. (Note) The name (Ubayy) was not attributed in "al-Adab al-Mufrad," which caused oversight