Concerning whom was the verse revealed: "Your guardian is none but Allah and His Messenger and those who believe - those who establish prayer and give zakat, and who bow [in worship]," and on what occasion?

Interpretations of the verse "Take not the Jews and Christians as awliya" mention that it was revealed concerning Abdullah ibn Ubayy ibn Salul, who apostatized out of fear of the Jews, while Ubada ibn al-Samit disavowed their alliance. As for verse (55) of Al-Ma'idah, it was revealed concerning Ubada ibn al-Samit and the believers. What has been reported about its revelation concerning Ali ibn Abi Talib and his giving charity with his ring during prayer is not established and not authentic.