Evidence of the Birth of the Master of the Age
Kitāb al-Ghayba|Volume 1|Book 1|Chapter 34
قال حنظلة: فدعوت بأبي الفرج المظفر بن أحمد حتى سمع معي (منه) هذا الخبر.
Hanzala, the narrator of this report says: I called Abul Faraj Muzaffar bin Ahmad and he also heard this story with me.