﴿ ۞ 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 غَفُورٌۭ رَّحِيمٌ ﴾

“THE BEDOUIN say, “We have attained to faith.” Say [unto them, O Muhammad]: “You have not [yet] attained to faith; you should [rather] say, ‘We have [outwardly] surrendered’ - for [true] faith has not yet entered your hearts. But if you [truly] pay heed unto God and His Apostle, He will not let the least of your deeds go to waste: for, behold, God is much-forgiving, a dispenser of grace.””

There were many small tribes around the Madinah township. After the immigration of the Prophet to Madinah, these people embraced Islam. But their embracing of Islam was not the result of any deep mental revolution. In the eyes of God, the person who genuinely adopts the faith of Islam is one who discovers Islam as a reality and enshrines it in the depths of his heart. Those who accept the Faith of God in this manner acquire eternal conviction. Their steadfastness is such they are ready to make any sacrifice. One may perform some righteous deed then think it necessary to announce the fact, but such announcement actually has a nullifying effect. A truly righteous deed is one which is done purely for the sake of God. As God Himself knows everything, where is the necessity to advertise it?