Surah Al-Hujurat (The Private Quarters), Verse 14

قَالَتِ الْاَعْرَابُ اٰمَنَّا قُلْ لَّمْ تُؤْمِنُوْا وَلٰكِنْ قُوْلُوْۤا اَسْلَمْنَا وَلَمَّا یَدْخُلِ الْاِیْمَانُ فِیْ قُلُوْبِكُمْ وَاِنْ تُطِیْعُوا اللّٰهَ وَرَسُوْلَهٗ لَا یَلِتْكُمْ مِّنْ اَعْمَالِكُمْ شَیْـًٔا اِنَّ اللّٰهَ غَفُوْرٌ رَّحِیْمٌ ۟

Qaalatil-A 'raabu aamannaa qul lam tu'minoo wa laakin qoolooo aslamnaa wa lamma yadkhulil eemaanu fee quloobikum wa in tutee'ul laaha wa Rasoolahoo laa yalitkum min a'maalikum shai'aa; innal laaha Ghafoorur Raheem

“The desert Arabs say, "We believe." Say, "Ye have no faith; but ye (only) say, 'We have submitted our wills to Allah,' For not yet has Faith entered your hearts. But if ye obey Allah and His Messenger, He will not belittle aught of your deeds: for Allah is Oft-Forgiving, Most Merciful."”

Quran 49:14 (Yusuf Ali Translation)