قالَتِ الأَعرابُ آمَنّا ۖ قُل لَم تُؤمِنوا وَلـٰكِن قولوا أَسلَمنا وَلَمّا يَدخُلِ الإيمانُ في قُلوبِكُم ۖ وَإِن تُطيعُوا اللَّهَ وَرَسولَهُ لا يَلِتكُم مِن أَعمالِكُم شَيئًا ۚ إِنَّ اللَّهَ غَفورٌ رَحيمٌ

The bedouins say, "We have believed." Say, "You have not [yet] believed; but say [instead], 'We have submitted,' for faith has not yet entered your hearts. And if you obey Allah and His Messenger, He will not deprive you from your deeds of anything. Indeed, Allah is Forgiving and Merciful."