The event of Mubahila is when the below ayah was revealed and Allah (swt) honoured the ahlulbayt (as) with a great status. Imam Ali (as) was referenced and equated as the “self” of the Messenger of Allah (sawa), al-Hassan and al-Hussain as the “sons” of the Messenger (sawa) and Fatima (as) as the “women” of the Messenger (sawa). No other companion or wife was given this high status, and the Prophet (sawa) named them the Ahlulbayt (as).

We first look at the ayah and then ‘Sunni’ sources for whom this ayah was revealed upon.

فَمَنْ حَاجَّكَ فِيهِ مِن بَعْدِ مَا جَاءَكَ مِنَ الْعِلْمِ فَقُلْ تَعَالَوْا نَدْعُ أَبْنَاءَنَا وَأَبْنَاءَكُمْ وَنِسَاءَنَا وَنِسَاءَكُمْ وَأَنفُسَنَا وَأَنفُسَكُمْ ثُمَّ نَبْتَهِلْ فَنَجْعَل لَّعْنَتَ اللَّهِ عَلَى الْكَاذِبِينَ

But whoever disputes with you in this matter after what has come to you of knowledge, then say: Come let us call our sons and your sons and our women and your women and ourselves and yourselves, then let us be earnest in prayer, and pray for the curse of Allah on the liars. (3:61)

Jabir (ibn Abdullah al-Ansari) said about this ayah: ourselvesthe Prophet (sawa) and Ali (as), our sons al-Hassan (as) and al-Hussain (as), our women Fatima (as).

Source: al-Durr al-Manthoor, al-Suyuti, Volume 2, Page 38-39 (See Image below)

Grading: al-Suyuti said al-Haakim graded it Sahih

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Narrated ‘Amir bin Sa’d bin Abi Waqqas:
from his father who said: “When this Ayah was revealed: ‘Come, let us call our sons and your sons, our women and your women… (3:61)’ the Messenger of Allah (ﷺ) called ‘Ali, Fatimah, Hasan and Husain and said: ‘O Allah! This is my family.'”
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ، عَنْ بُكَيْرِ بْنِ مِسْمَارٍ، هُوَ مَدَنِيٌّ ثِقَةٌ عَنْ عَامِرِ بْنِ سَعْدِ بْنِ أَبِي وَقَّاصٍ، عَنْ أَبِيهِ، قَالَ لَمَّا أَنْزَلَ اللَّهُ هَذِهِ الآيَةَ ‏:‏ ‏(‏ نَدْعُ أَبْنَاءَنَا وَأَبْنَاءَكُمْ ‏)‏ دَعَا رَسُولُ اللَّهِ صلى الله عليه وسلم عَلِيًّا وَفَاطِمَةَ وَحَسَنًا وَحُسَيْنًا فَقَالَ ‏”‏ اللَّهُمَّ هَؤُلاَءِ أَهْلِي ‏”

‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ صَحِيحٌ ‏.‏

English reference: Tirmidhi, Vol. 5, Book 44, Hadith 2999

Grading: Sahih (Darussalam)

Narrated ‘Amir bin Sa’d bin Abi Waqqas:
from his father who said: “When this Ayah was revealed: ‘Come, let us call our sons and your sons, our women and your women… (3:61)’ the Messenger of Allah (ﷺ) called ‘Ali, Fatimah, Hasan and Husain and said: ‘O Allah! This is my family.'”

Source: al-Haakim, Volume 3, Page 150, Hadith #4719 (See Image below)

Grading: al-Haakim says it is Sahih according to the conditions of Bukhari and Muslim, but they did not include it in their books. al-Dhahabi concurs and says it is Sahih/Authentic on the conditions of Bukhari and Muslim (See Image below)

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Amir b. Sa’d b. Abi Waqqas reported on the authority of his father that Muawiya b. Abi Sufyan appointed Sa’d as the Governor and said:
What prevents you from abusing Abu Turab (Hadrat ‘Ali), whereupon be said: It is because of three things which I remember Allah’s Messenger (ﷺ) having said about him that I would not abuse him and even if I find one of those three things for me, it would be more dear to me than the red camels. I heard Allah’s Messenger (ﷺ) say about ‘Ali as he left him behind in one of his campaigns (that was Tabuk). ‘Ali said to him: Allah’s Messenger, you leave me behind along with women and children. Thereupon Allah’s Messenger (ﷺ) said to him: Aren’t you satisfied with being unto me what Aaron was unto Moses but with this exception that there is no prophethood after me. And I (also) heard him say on the Day of Khaibar: I would certainly give this standard to a person who loves Allah and his Messenger, and Allah and his Messenger love him too. He (the narrator) said: We had been anxiously waiting for it, when he (the Holy Prophet) said: Call ‘Ali. He was called and his eyes were inflamed. He applied saliva to his eyes and handed over the standard to him, and Allah gave him victory. (The third occasion is this) when the (following) verse was revealed: “Let us summon our children and your children.” Allah’s Messenger (ﷺ) called ‘Ali, Fatima, Hasan and Husain and said: O Allah, they are my family.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَمُحَمَّدُ بْنُ عَبَّادٍ، – وَتَقَارَبَا فِي اللَّفْظِ – قَالاَ حَدَّثَنَا حَاتِمٌ، – وَهُوَ ابْنُ إِسْمَاعِيلَ – عَنْ بُكَيْرِ بْنِ مِسْمَارٍ، عَنْ عَامِرِ بْنِ سَعْدِ بْنِ أَبِي وَقَّاصٍ، عَنْ أَبِيهِ، قَالَ أَمَرَ مُعَاوِيَةُ بْنُ أَبِي سُفْيَانَ سَعْدًا فَقَالَ مَا مَنَعَكَ أَنْ تَسُبَّ أَبَا التُّرَابِ فَقَالَ أَمَّا مَا ذَكَرْتُ ثَلاَثًا قَالَهُنَّ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم فَلَنْ أَسُبَّهُ لأَنْ تَكُونَ لِي وَاحِدَةٌ مِنْهُنَّ أَحَبُّ إِلَىَّ مِنْ حُمْرِ النَّعَمِ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ لَهُ خَلَّفَهُ فِي بَعْضِ مَغَازِيهِ فَقَالَ لَهُ عَلِيٌّ يَا رَسُولَ اللَّهِ خَلَّفْتَنِي مَعَ النِّسَاءِ وَالصِّبْيَانِ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏”‏ أَمَا تَرْضَى أَنْ تَكُونَ مِنِّي بِمَنْزِلَةِ هَارُونَ مِنْ مُوسَى إِلاَّ أَنَّهُ لاَ نُبُوَّةَ بَعْدِي ‏”‏ ‏.‏ وَسَمِعْتُهُ يَقُولُ يَوْمَ خَيْبَرَ ‏”‏ لأُعْطِيَنَّ الرَّايَةَ رَجُلاً يُحِبُّ اللَّهَ وَرَسُولَهُ وَيُحِبُّهُ اللَّهُ وَرَسُولُهُ ‏”‏ ‏.‏ قَالَ فَتَطَاوَلْنَا لَهَا فَقَالَ ‏”‏ ادْعُوا لِي عَلِيًّا ‏”‏ ‏.‏ فَأُتِيَ بِهِ أَرْمَدَ فَبَصَقَ فِي عَيْنِهِ وَدَفَعَ الرَّايَةَ إِلَيْهِ فَفَتَحَ اللَّهُ عَلَيْهِ وَلَمَّا نَزَلَتْ هَذِهِ الآيَةُ ‏{‏ فَقُلْ تَعَالَوْا نَدْعُ أَبْنَاءَنَا وَأَبْنَاءَكُمْ‏}‏ دَعَا رَسُولُ اللَّهِ صلى الله عليه وسلم عَلِيًّا وَفَاطِمَةَ وَحَسَنًا وَحُسَيْنًا فَقَالَ ‏”‏ اللَّهُمَّ هَؤُلاَءِ أَهْلِي ‏”‏ ‏.‏

Source: Sahih Muslim 2404 d

Link: http://sunnah.com/muslim/44/50