Proof of Bay‘ah from the Qur’an and Hadith
Question
This servant [of Allah] is a disciple (bound by bay‘ah) to a certain pious man. Formerly my state was such that I sometimes prayed and sometimes did not, my tongue was accustomed to cursing, I lied a great deal, I even swore false oaths, I recited the Holy Qur’an only occasionally, in Ramadan, I made no distinction whatsoever between lawful and unlawful earnings, I showed no respect to my elders, and I was frequently quarrelling and behaving badly with my neighbours.
Answer
Tell this person to read Surah al-Fath: in it is stated: [ar]إِنَّ ٱلَّذِينَ يُبَايِعُونَكَ إِنَّمَا يُبَايِعُونَ ٱللَّهَ يَدُ ٱللَّهِ فَوْقَ أَيْدِيهِمْ ۚ فَمَن نَّكَثَ فَإِنَّمَا يَنكُثُ عَلَىٰ نَفْسِهِۦ ۖ وَمَنْ أَوْفَىٰ بِمَا عَـٰهَدَ عَلَيْهُ ٱللَّهَ فَسَيُؤْتِيهِ أَجْرًا عَظِيمًا[/ar] “Indeed, those who pledge allegiance to you [O Muhammad] are pledging allegiance only…
Source: Fatawa Mahmudiyya
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