Muḥammad ibn Yaḥyā, Isḥāq al-Kawsaj, Sulaymān ibn Sayf, ʿAlī ibn Salamah al-Labaqī, ʿAbd ibn Ḥumayd, Muḥammad ibn Isḥāq al-Ṣāghānī, Muḥammad ibn ʿAbd Allāh al-Mukharrimī, Aḥmad ibn Saʿīd al-Ribāṭī, ʿAbbās al-Dūrī, his nephew ʿUbayd Allāh ibn Saʿd, al-Faḍl ibn Sahl al-Aʿraj, Yaʿqūb ibn Shaybah, and many others.
Yaḥyā, al-ʿIjlī, and a group of scholars rated him thiqah (trustworthy). Abū Ḥātim said, “He is ṣadūq (reliably truthful).” (1)
Al-Dhuhlī remarked: “Ibrāhīm ibn Saʿd narrated from al-Zuhrī and from al-Zuhrī’s students after him. His transmissions of al-Zuhrī’s ḥadīth are numerous, and he even reports singular narrations from him. The main conduit for his narrations is his son Yaʿqūb ibn Ibrāhīm; both he and his brother Saʿd studied the written collections.
“Saʿd died before any prominent scholar had the chance to write much from him, whereas Yaʿqūb lived on, so people recorded from him and found with him a substantial body of knowledge from al-Zuhrī and others.” (2)
Ibn Saʿd said: “He was trustworthy and dependable, surpassing his brother in virtue, piety, and ḥadīth. He remained in Baghdad, then traveled to al-Ḥasan ibn Sahl at Fam al-Ṣilḥ (3) and stayed with him until he died there in Shawwāl, 208 AH. He was four years younger than his brother Saʿd.” (4)
Several other authorities reported the same date for his death.