Bay'ah ni wajibu juu ya Waislamu wote, na pia ni haki ya kila Muislamu, mwanamume na mwanamke. Dalili zinazohusu Bay'ah kuwa wajibu ni nyingi; miongoni mwazo ni kauli ya Mtume wa Allah ﷺ:

The Bay’ah is an obligation upon all Muslims and it is also the right of every Muslim, male and female. The evidences concerning the Bay’ah being an obligation are numerous; of these is the speech of the Messenger of Allah (pbuh):

“Yeyote atakayekufa wakati hakuna ahadi ya utiifu (Bay'ah) shingoni mwake, atakufa kifo cha siku za ujinga (Jahiliyyah).” [Imepokewa na Muslim] Ukweli kwamba Bay'ah yenyewe inaonyesha kuwa ni haki ya Waislamu, unafahamika kutoka katika Bay'ah yenyewe, kwani hutolewa na Waislamu kwa Khalifah, wala si kutoka kwa Khalifah kwa Waislamu. Bay'ah ya Waislamu kwa Mtume wa Allah ﷺ imethibitishwa katika Hadithi nyingi sahihi zilizoorodheshwa kuwa Sahih. Katika Al-Bukhari, imepokewa kwamba Ubadah Ibnus Samit alisema:

“Whoever dies while there was no allegiance on his neck dies a death of the days of ignorance (Jahiliyyah).” [Narrated by Muslim] The fact that the Bay’ah itself indicates that it is the right of the Muslims, is understood from the Bay’ah itself, for it is from the Muslims to the Khaleefah, and not from the Khaleefah to the Muslims. The Bay’ah of the Muslims to the Messenger of Allah (pbuh) has been confirmed in much sound Ahadith listed as Sahih. In Al-Bukhari, it has been reported that Ubadah Ibnus Samit said: