Evidence of the Birth of the Master of the Age
Kitāb al-Ghayba|Volume 1|Book 1|Chapter 34
197- وقد تقدمت الرواية من قول أبي محمد عليه السلام حين ولد له: وزعمت الظلمة أنهم يقتلونني ليقطعوا هذا النسل. فكيف رأوا قدرة الله؟ وسماه المؤمل.
H 197 - Previously it was narrated that Imam Hasan Askari عليه السلام remarked at the birth of the Master of Affair: The oppressors presumed that they would kill me and cut off this blessed progeny. So how did they witness the might of Allah?” Then he named him Muammal (one in whom hopes rest).