Surat Al-Hujuraat (The Inner Apartments) - الحجرات

قَالَتِ ٱلْأَعْرَابُ ءَامَنَّا قُل لَّمْ تُؤْمِنُوا۟ وَلَٰكِن قُولُوٓا۟ أَسْلَمْنَا وَلَمَّا يَدْخُلِ ٱلْإِيمَٰنُ فِى قُلُوبِكُمْ وَإِن تُطِيعُوا۟ ٱللَّهَ وَرَسُولَهُۥ لَا يَلِتْكُم مِّنْ أَعْمَٰلِكُمْ شَيْـًٔا إِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ ﴿١٤﴾ إِنَّمَا ٱلْمُؤْمِنُونَ ٱلَّذِينَ ءَامَنُوا۟ بِٱللَّهِ وَرَسُولِهِۦ ثُمَّ لَمْ يَرْتَابُوا۟ وَجَٰهَدُوا۟ بِأَمْوَٰلِهِمْ وَأَنفُسِهِمْ فِى سَبِيلِ ٱللَّهِ أُو۟لَٰٓئِكَ هُمُ ٱلصَّٰدِقُونَ﴿١٥﴾

The dwellers of the desert say: We believe. Say: You do not believe but say, We submit; and faith has not yet entered into your hearts; and if you obey Allah and His Apostle, He will not diminish aught of your deeds; surely Allah is Forgiving, Merciful. The believers are only those who believe in Allah and His Apostle then they doubt not and struggle hard with their wealth and their lives in the way of Allah; they are the truthful ones.