Mas'udi's Mazahir al-Akhbar

A book by al-Mas'udi on the reports of the pure and righteous elect. ²

In it he gives the account of Ammar ibn Yasir (may God be pleased with him) when mentioning the fifty notables who pledged to Ali to the death. Al-Mas'udi mentions it together with "Hadaiq al-Adhhan" at the end of the chapter on Ali. ^{2 3}