Mandatory conditions of shia faith

Book: al-Akaidu.
Author: Muhammad Baqir Majlisi.
“From mandatory (conditions) of faith of imamiyah, belief in permissibility of al-mutah and haj at-tamattu, and al-barra from 3 (1) {and Moawiyah and Yazid ibn Moawiyah and all) that fought against commander of faithful -salawatullah alaihi – or any other from aimma, and from all killers (or those who involved in killing) of Hussain – salawatullah alaihi – and (correctness) of saying /haya ala hayral amal/ in azan”.
1) Abu Bakr, Umar and Uthman.