His command is regarded as a final decree and his conduct infallible due to the divine support (Ta’yeed) he receives from the Imam.

States People Centers Other According to Ismā'īlī [Musta'ali Tayyabī] tradition, before the 21st Fatimid [Musta'ali] Imam, Taiyab abi al-Qasim went into state of occultation from Cairo in 528 AH/1134 AD, his father, the 20th Imām al-Amīr had instructed Queen Arwa al-Sulayhi/Al-Hurra Al-Malika in Yemen to anoint a vicegerent after the occultation of his son al-Tayyib Abu'l-Qasim.

It is a declaration and designation through divine indication and Allah’s spiritual intervention-تأئید إلھي for the appointment of a successor-منصوص, be it an Imam or (during the Imam’s concealment) a Dai-داعي by his incumbent appointer-ناص among the faithful, publicly-نص جلي or privately نص خفي and at times supported by written documentary orders-سجل شریف.

The tradition stems from the events of Ghadir Khum where Mohammad appointed his son-in-law, cousin and his heir 'Ali bin Abi Taalib as his Vicegerent, legatee and Wali[3] of the Faithful.

The Alavi Bohras are a smaller group of Tayyibi Ismailis, who followed Ali Shams al-Din V as the successor to Sheikh Adam Safiuddin, thus deriving their name from him.

The Sulaymanis are a smaller group of Tayyibi Ismailis, who followed Sulayman bin Hassan as the successor to Da'ud Burhan al-Din, thus deriving their name from him.

The Atba-i-Malak community are a branch of Musta'ali Isma'ili Shi'a Islam that broke off from the mainstream Dawoodi Bohra after the death of the 46th Da'i al-Mutlaq, under the leadership of Abdul Hussain Jivaji in 1840.

The Atba-e-Malak Vakil continues the tradition of Nass after the untimely demise of the 46th Da'i al-Mutlaq Syedna Mohammad Badruddin saheb.