“And who is better in speech than he who invites to Allaah, does righteous good deeds and says, I am one of the Muslims.
(Suraah Fussilaat: 33)
Al-Hassan al-Basree said explaining this verse, “This is the beloved of Allaah, this is the close friend of Allaah, this is the chosen one of Allaah, this is the most beloved of all the people of earth to Allaah. He responded to the call of Allaah and called mankind to that to which he had responded. He did righteous good deeds in response to it and said, ‘I am one of the Muslims.’ This is Allaah’s khaleefah.”
Authentically reported in Tafseer ibn Kathir