Al-Hujurat · 49:14

14. When some of the bedouins came to the Prophet (peace be upon him), they said, “We have brought faith in Allah and His Messenger.” O Messenger! Say to them: “You have not brought faith, instead, say: “We have submitted and obeyed”. Faith has not yet entered your hearts; it is hoped that it does enter. O bedouins! If you obey Allah and His Messenger in faith, in doing good deeds, and in refraining from the unlawful, Allah will not decrease the reward of your deeds in the slightest. Indeed, Allah Forgiving of those of His servants who repent and is merciful to them.”