They both pointed out that sharing his kunya and scholarly rank was Sulaymān ibn Sayf al-Ḥarrānī, so it is possible that he is the one intended.

3 — Among them is his shaykh, Imām Aḥmad ibn Ḥanbal. He took from him the ḥadīth of Abū al-ʿAshrāʾ al-Dārimī, on the authority of his father, that the Prophet, peace and blessings be upon him, was asked about al-ʿatīrah (the sacrifice offered in Rajab), and he approved of it. Abū Bakr al-Khallāl said: Aḥmad ibn Ḥanbal heard from him a single ḥadīth, which Abū Dāwūd used to mention.¹ We say: al-Ḥāfiẓ al-Mizzī has mentioned Abū Bakr al-Khallāl among the students of Abū Dāwūd.²

4 — Zakariyyā ibn Yaḥyā ibn ʿAbd al-Raḥmān al-Sājī. Al-Ḥāfiẓ al-Dhahabī described him, saying: The Imām, the reliable, the ḥāfiẓ, the muḥaddith of Baṣrah, its shaykh, and its muftī. We say: He is the one who praised the book "al-Sunan" of Abū Dāwūd, saying: The Book of God, the Mighty and Majestic, is the foundation of Islam, and the book "al-Sunan" of Abū Dāwūd is the covenant of Islam. He authored works on jurisprudence and on the defects of ḥadīth. He died in the year three hundred and seven.³

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¹ Al-Dhahabī said in "Siyar Aʿlām al-Nubalāʾ" 13/211: It is the ḥadīth of Abū Dāwūd [2825], from Muḥammad ibn ʿAmr al-Rāzī, from ʿAbd al-Raḥmān ibn Qays, from Ḥammād ibn Salamah, from Abū al-ʿAshrāʾ, from his father, that the Prophet, peace and blessings be upon him, was asked about al-ʿatīrah and he approved of it. This is a munkar ḥadīth; Ibn Qays was criticized on account of it. What is preserved from Ḥammād with this chain is only the ḥadīth: "Is slaughtering not but in the throat and chest?" We say: The rest of the ḥadīth is: "And if you stabbed her in the thigh, it would suffice you." It was also narrated by al-Tirmidhī (1551) and Ibn Mājah (3184). Abū al-ʿAshrāʾ is unknown, and in "al-Tahdhīb": al-Maymūnī said: I asked Aḥmad about the ḥadīth of Abū al-ʿAshrāʾ concerning slaughtering, and he said: In my view it is an error; it does not please me, and I do not follow it except in a case of necessity. He said: I do not know that anything other than this ḥadīth is narrated from Abū al-ʿAshrāʾ.

² Al-Mizzī in "Tahdhīb al-Kamāl" in the biography of Abū Dāwūd.

³ Ibn ʿAsākir in his "Tārīkh" 7/folio 547, Abū Isḥāq al-Shīrāzī in "Ṭabaqāt al-Fuqahāʾ" p. 104, and al-Dhahabī in "al-Siyar" 14/197–200.