ascribed to the Prophet. Al-Tirmidhī said: "A ḥasan ṣaḥīḥ ḥadīth." This is what he said, although both al-Ḥajjāj and Abū al-Zubayr are known to obscure their sources. Ibn al-Turkumānī reported in "al-Jawhar al-Naqī" (5/290) that al-Tirmidhī said: "A ḥasan ḥadīth." This is closer to being correct, for when al-Tirmidhī describes a ḥadīth as "ḥasan," he does not mean its isnād is ḥasan, but rather that it is ḥasan due to other supporting evidence, and this is the case here. For I have seen supporting evidence for it from the narration of Khalaf ibn Khalīfah, from Abū Janāb, from his father, from Ibn ʿUmar: "... A man stood up and said: O Messenger of Allāh! What about a man who sells a horse for horses and a camel for camels? He said: There is no harm if it is hand to hand." It was recorded by Aḥmad (2/109) and al-Ṭabarānī in "al-Kabīr" as mentioned in "Majmaʿ al-Zawāʾid," and he said (4/105): "In it is Abū Janāb al-Kalbī, who is known to obscure his sources." I said: His name is Yaḥyā ibn Abī Ḥayyah. Al-Ḥāfiẓ said: "They weakened him due to his frequent obscuring of sources." His father, Abū Ḥayyah, is unknown. Khalaf ibn Khalīfah is truthful but became confused in his later years. The ḥadīth is also supported by the narration of Samurah and others ascribed to the Prophet: