I (the author) add: He refused to take reports from Yaʿlā ibn al-Ashdaq because he once heard him resort to coarse language when speaking. He died in Safar of the year 244 AH.

167 – Al-Khaṭmī, Isḥāq ibn Mūsā ibn ʿAbd Allāh (cited by Muslim, al-Tirmidhī, al-Nasāʾī, and Ibn Mājah)

The Imām, ḥāfiẓ, and reliable judge, Abū Mūsā Isḥāq ibn Mūsā ibn ʿAbd Allāh ibn Mūsā ibn ʿAbd Allāh ibn Yazīd al-Khaṭmī al-Anṣārī al-Madanī, a jurist who resided first in Sāmarrāʾ and later served as chief judge of Nīshāpūr.

He heard ḥadīth from Sufyān ibn ʿUyaynah, ʿAbd al-Salām ibn Ḥarb, Maʿn ibn ʿĪsā al-Qazzāz, and many others.

Among those who transmitted from him are Muslim, al-Tirmidhī, al-Nasāʾī, Ibn Mājah, Baqī ibn Makhlad, Jaʿfar al-Firiyābī, his son Mūsā ibn Isḥāq, Abū Bakr ibn Khuzaymah, and others.

He was regarded as one of the foremost imams of the Sunnah.

Abū Ḥātim lavished praise upon him.

Al-Nasāʾī and others declared him “trustworthy.”

Al-Tirmidhī narrates from him frequently, introducing his reports with the phrase, “The Anṣārī related to us.”

He possesses a ḥadīth for which he is the sole transmitter.