Sound; Humayd al-Tawil is the only one who transmitted it.

The compilers of the six canonical collections (1) recorded the hadith through the chain of Ibn ʿUlayya, and a number of others narrated it from him as well.

Ahmad ibn Hanbal used to dislike the codification of legal questions and would urge the writing of transmitted reports instead. ʿAbd al-Rahman ibn Khāqan said: “I asked Ahmad ibn Hanbal about Abū Thawr, and he replied,
‘Nothing but good has reached me about him, except that I dislike the speculative discourse they insert into their books.’” (2)

It is also reported that Ahmad was asked about a certain issue and said to the questioner, “Ask someone else—ask the jurists—ask Abū Thawr.” (3)

Badr (4) ibn Mujāhid said: Sulaymān al-Shādhakūnī told me, “Write down al-Shāfiʿī’s opinion, then go to Abū Thawr, and make sure you do not miss hearing it from him personally.” (5)

Al-Khaṭīb remarked: “Abū Thawr first sought jurisprudence on the basis of opinion, following the view of the Iraqis, until al-Shāfiʿī arrived. He then attended his lessons and turned from opinion to hadith.” (6)

Abū Ḥātim (7) said: “He speaks on the basis of personal reasoning—sometimes he is mistaken and sometimes correct; that is not really his forte.”