Surat Al-Ĥujurāt - سورة الحجرات

قَالَتِ الْأَعْرَابُ آمَنَّا ۖ قُل لَّمْ تُؤْمِنُوا وَلَٰكِن قُولُوا أَسْلَمْنَا وَلَمَّا يَدْخُلِ الْإِيمَانُ فِي قُلُوبِكُمْ ۖ وَإِن تُطِيعُوا اللَّهَ وَرَسُولَهُ لَا يَلِتْكُم مِّنْ أَعْمَالِكُمْ شَيْئًا ۚ إِنَّ اللَّهَ غَفُورٌ رَّحِيمٌ

Muhsin Khan: The bedouins say: "We believe." Say: "You believe not but you only say, 'We have surrendered (in Islam),' for Faith has not yet entered your hearts. But if you obey Allah and His Messenger (SAW), He will not decrease anything in reward for your deeds. Verily, Allah is Oft-Forgiving, Most Merciful."