yet his narrations are not taken as authoritative proof.
al-Nasāʾī said: “There is nothing objectionable about him.”
Yaḥyā al-Qaṭṭān remarked: “He was somewhat heedless.”
Aḥmad said: “His ḥadīth is inconsistent.”

Salm ibn Qutaybah related:
“I returned from Kufa, whereupon Shuʿbah asked me, ‘Whom did you meet?’
I replied, ‘I met Yūnus ibn Abī Isḥāq.’
He asked, ‘What did he narrate to you?’
I informed him, and he fell silent for a while. Then I said to him—
he (1) had told us a report from Bakr ibn Māʿiz.
Shuʿbah retorted, ‘Did he not also say to you, “Bakr ibn Māʿiz narrated to us from Ibn Masʿūd”?!’”

Ibn al-Madīnī said:
“I heard Yaḥyā speak about Yūnus ibn Abī Isḥāq and say,
‘He was heedless (2); it was simply his disposition. He would say, “My father narrated to me—I heard ʿAdī ibn Ḥātim say:
‘Shield yourselves from the Fire, even with half a date.’ (3)”’
Then Yaḥyā added, ‘Yet both Sufyān and Shuʿbah report the ḥadīth as: from Abū Isḥāq, from ʿAbd Allāh ibn Maʿqil, from ʿAdī ibn Ḥātim.’”

I say: His two sons are more precise than he, though his ḥadīth is ḥasan.
They said: He died in 159 AH.

11 – Yūsuf ibn Isḥāq, grandson of the eminent Abū Isḥāq al-Sabīʿī (ʿ)
He narrated from his father, who reported from his grandfather.
He also heard from al-Shaʿbī, Muḥammad ibn al-Munkadir, and his grandfather.
Transmitters from him include his two cousins, Isrāʾīl and ʿĪsā, as well as his son, Ibrāhīm ibn Yūsuf.