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Shiavault - a Vault of Shia Islamic Books A Shi'ite Encyclopedia (chapter 2-3) Certainly Your Master Is ... Certainly your Master is Allah and His Messenger and those who believe who eshtablish prayer and give charity while they bow. And who ever takes Allah and His Messenger and those who believe as a guardian, so surely the party of Allah will be victorious.
(Quran 5:55-56) It is unanimous that the verse descended about Imam Ali (AS) when he gave away in charity his ring while he was in a state of kneeling in his prayer. This is also authenticated successively according to the 12 Imams.
Here are some of the Shi'ite references Bihar al-Anwar, by Allama Majlisi Tafseer al-Mizan, by Allama Tabatabai Tafseer al-Kashaf, by Allama Muhammad Jawad Mughniyah al-Ghadir, by Allama Abdul Husain Ahmad al-Amini Asbat al-Hudate, by Allama Muhammad Ibn Hasan Amuli But for the sake of the readers I shall produce some Sunni references, and traditions in this respect through other sources.
Many Sunni commentators of the Quran confirm the fact that the above verse descended on the honor of Imam Ali (AS) and many Sunni scholars have also mentioned the unanimity or consensus of opinion in their books.
Here are some references in this regard: (1) Tafsir al-Kabir, by Ahmad Ibn Muhammad al-Tha'labi, under Verse 5:55 (2) Tafsir al-Kabir, by Ibn Jarir al-Tabari, v6, pp 186,288-289 (3) Tafsir Jamiul Hukam al-Quran, by Muhammad Ibn Ahmad Qurtubi, v6, p219 (4) Tafsir al-Khazin, v2, p68 (5) Tafsir al-Durr al-Manthoor, by al-Suyuti, v2, pp 293-294 (6) Tafsir al-Kashshaf, by al-Zamakhshari, Egypt 1373, v1, pp 505,649 (7) Asbab al-Nuzool, by Jalaluddin al-Suyuti, Egypt 1382, v1, p73 on the authority of Ibn Abbas (8) Asbab al-Nuzool, by al-Wahidi, on the authority of Ibn Abbas (9) Sharh al-Tjrid, by Allama Qushji (10) Ahkam al-Quran, al-Jassas, v2, pp 542-543 (11) Musnad Ahmad Ibn Hanbal, v5, p38 (12) Kanzul Ummal, by al-Muttaqi al-Hindi, v6, p391, Tradition #5991 (13) al-Awsat, by Tabarani, narrated from Ammar Yasir (14) Ibn Mardawayh, on the authority of Ibn Abbas ...
and more. There is also a tradition related by Ibn Salam whose chain of sources rises up to the Prophet (PBUH&HF) himself. Please refer to the Sahih of Nisa'i or the commentary of Sura Ma'idah in Jam'a Bayn al-Sihah al-Sittah. In Ghayah al-Maram, p18, Sayyid al-Bahrayni forwards twenty four (24) traditions from sources other than the Ahlul-Bayt, all supporting the above fact.