His son, Qāsim ibn Thābit, was counted among the handful of outstandingly gifted minds; he died as a young man sometime after 300 AH.

Abū Saʿīd ibn Yūnus said, “Thābit died in 314 AH.”

Abū al-Rabīʿ ibn Sālim stated: “Among the writings produced in our land is the book Dalāʾil on rare usages—a work that neither Abū ʿUbayd nor Ibn Qutaybah mentioned—authored by Qāsim ibn Thābit al-Saraqustī. He devoted great care to composing it, but died before completing it, so his father finished it for him.

“The two of them attended the same auditions and undertook the same journey. I heard this from Ibn Ḥubaysh, who said:

‘Jaʿfar ibn Muḥammad ibn Makkī narrated it to us; Ibn Sirāj narrated to us; from Yūnus ibn ʿAbd Allāh the judge; from al-ʿAbbās ibn ʿUmar al-Ṣiqillī; from Thābit ibn Qāsim ibn Thābit, who reported from his grandfather by direct reading and from his own son by written authorization—an arrangement opposite to what is usually encountered.’

“His father died around 302 AH. It is reported that the judgeship of his town was offered to him, but he declined. His father tried to compel him to accept, whereupon he asked for three days’ respite; within those three days he died. People therefore believed he had prayed for death, for his supplications were known to be answered.

“Abū ʿAlī al-Qālī copied this book and used to say, ‘Nothing like it has ever been produced in al-Andalus.’

322 – ʿAbd Allah ibn Muẓāhir, Abū Muḥammad al-Iṣbahānī
A ḥāfiẓ, brilliant scholar, and one of the singularly intelligent figures.
It has reached us that he memorised the entire Musnad, after which he set about memorising the statements of the Companions.