The Pledge of Allegiance (Bay'ah) in the Holy Quran

﴿۞ إِنَّ ٱللَّهَ ٱشۡتَرَىٰ مِنَ ٱلۡمُؤۡمِنِينَ أَنفُسَهُمۡ وَأَمۡوَٰلَهُم بِأَنَّ لَهُمُ ٱلۡجَنَّةَۚ يُقَٰتِلُونَ فِي سَبِيلِ ٱللَّهِ فَيَقۡتُلُونَ وَيُقۡتَلُونَۖ وَعۡدًا عَلَيۡهِ حَقّٗا فِي ٱلتَّوۡرَىٰةِ وَٱلۡإِنجِيلِ وَٱلۡقُرۡءَانِۚ وَمَنۡ أَوۡفَىٰ بِعَهۡدِهِۦ مِنَ ٱللَّهِۚ فَٱسۡتَبۡشِرُواْ بِبَيۡعِكُمُ ٱلَّذِي بَايَعۡتُم بِهِۦۚ وَذَٰلِكَ هُوَ ٱلۡفَوۡزُ ٱلۡعَظِيمُ ﴾ [At-Taubah: 111]

(111) Indeed, Allah has purchased from the believers their lives and their properties [in exchange] for that they will have Paradise. They fight in the cause of Allah, so they kill and are killed. [It is] a true promise [binding] upon Him in the Torah and the Gospel and the Qur'an. And who is truer to his covenant than Allah? So rejoice in your transaction which you have contracted. And it is that which is the great attainment.

Surah: At-Taubah - Verse: 111 - Juz: 11 - Page: 204

﴿إِنَّ ٱلَّذِينَ يُبَايِعُونَكَ إِنَّمَا يُبَايِعُونَ ٱللَّهَ يَدُ ٱللَّهِ فَوۡقَ أَيۡدِيهِمۡۚ فَمَن نَّكَثَ فَإِنَّمَا يَنكُثُ عَلَىٰ نَفۡسِهِۦۖ وَمَنۡ أَوۡفَىٰ بِمَا عَٰهَدَ عَلَيۡهُ ٱللَّهَ فَسَيُؤۡتِيهِ أَجۡرًا عَظِيمٗا ﴾ [Al-Fatḥ: 10]

(10) Indeed, those who pledge allegiance to you, [O Muhammad] - they are actually pledging allegiance to Allah. The hand of Allah is over their hands. So he who breaks his word only breaks it to the detriment of himself. And he who fulfills that which he has promised Allah - He will give him a great reward.

Surah: Al-Fatḥ - Verse: 10 - Juz: 26 - Page: 512

﴿۞ لَّقَدۡ رَضِيَ ٱللَّهُ عَنِ ٱلۡمُؤۡمِنِينَ إِذۡ يُبَايِعُونَكَ تَحۡتَ ٱلشَّجَرَةِ فَعَلِمَ مَا فِي قُلُوبِهِمۡ فَأَنزَلَ ٱلسَّكِينَةَ عَلَيۡهِمۡ وَأَثَٰبَهُمۡ فَتۡحٗا قَرِيبٗا ﴾ [Al-Fatḥ: 18]

(18) Certainly was Allah pleased with the believers when they pledged allegiance to you, [O Muhammad], under the tree, and He knew what was in their hearts, so He sent down tranquillity upon them and rewarded them with an imminent conquest

Surah: Al-Fatḥ - Verse: 18 - Juz: 26 - Page: 513

﴿يَٰٓأَيُّهَا ٱلنَّبِيُّ إِذَا جَآءَكَ ٱلۡمُؤۡمِنَٰتُ يُبَايِعۡنَكَ عَلَىٰٓ أَن لَّا يُشۡرِكۡنَ بِٱللَّهِ شَيۡـٔٗا وَلَا يَسۡرِقۡنَ وَلَا يَزۡنِينَ وَلَا يَقۡتُلۡنَ أَوۡلَٰدَهُنَّ وَلَا يَأۡتِينَ بِبُهۡتَٰنٖ يَفۡتَرِينَهُۥ بَيۡنَ أَيۡدِيهِنَّ وَأَرۡجُلِهِنَّ وَلَا يَعۡصِينَكَ فِي مَعۡرُوفٖ فَبَايِعۡهُنَّ وَٱسۡتَغۡفِرۡ لَهُنَّ ٱللَّهَۚ إِنَّ ٱللَّهَ غَفُورٞ رَّحِيمٞ ﴾ [Al-Mumtaḥanah: 12]

(12) O Prophet, when the believing women come to you pledging to you that they will not associate anything with Allah, nor will they steal, nor will they commit unlawful sexual intercourse, nor will they kill their children, nor will they bring forth a slander they have invented between their arms and legs, nor will they disobey you in what is right - then accept their pledge and ask forgiveness for them of Allah. Indeed, Allah is Forgiving and Merciful.

Surah: Al-Mumtaḥanah - Verse: 12 - Juz: 28 - Page: 551