Who is the Yamani

Concerning the Features defining Al Yamani`s personality, it was narrated by Al-Imam Al-Baqir (A.S) “There is no banner better than that of the banner of Yamani, it is the banner of faith and dedication, because he calls to your possessor, so if the Yamani comes out, selling weapons to people or any Muslim becomes prohibited, and if the Yamani appears, stand up to him, because he’s banner is the banner of faith, and its prohibited for any Muslim to turn away from him, and who ever turns away from him, then he’s from the people of hell, because he calls to the truth and to the right path.”