Abū al-Rabīʿ al-Kalāʿī judged him to be “lenient” in transmission.
Ibn al-Zubayr said: “While still a boy he heard hadith from Abū al-Walīd ibn al-Dabbāgh and mastered the Seven Readings at the hands of Ibn Saʿīd.”
Al-Abbār remarked: “No one rivalled him in accuracy and tajwīd; both fathers and sons studied under him. In his later years he became confused, so he began narrating with chains of authority from various people he had met, and some of our own teachers took exception to that.”
Ibn Mushilīyūn added: “Al-Ḥaṣṣār could copy al-Taysīr in a single week and lived on the proceeds; he was scrupulously pious.”
I (the author) say: Al-Abbār transmitted extensively from him and vouched for him, yet he did not mention Ibn Saʿīd al-Dānī among his teachers.

10 – Zāhir ibn Rustum ibn Abī al-Rajāʾ al-Iṣbahānī
The imām, scholar, mufti, Qurʾān reciter, master of tajwīd, and exemplar: Abū Shujāʿ al-Iṣbahānī, later al-Baghdādī, a Shāfiʿī, Sufi, long-term resident near the sanctuary, and Imām of the Maqām.
He learned the various modes of recitation from Abū Muḥammad Sibt al-Khayyāṭ and from Abū al-Karam⦗1⦘, the author of al-Miṣbāḥ (The Lamp).