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Surah 4. An-Nisaa'
Ayah 146 - 147
146إِلَّا ٱلَّذِينَ تَابُوا۟ وَأَصْلَحُوا۟ وَٱعْتَصَمُوا۟ بِٱللَّهِ وَأَخْلَصُوا۟ دِينَهُمْ لِلَّهِ فَأُو۟لَـٰٓئِكَ مَعَ ٱلْمُؤْمِنِينَ ۖ وَسَوْفَ يُؤْتِ ٱللَّهُ ٱلْمُؤْمِنِينَ أَجْرًا عَظِيمًا
147مَّا يَفْعَلُ ٱللَّهُ بِعَذَابِكُمْ إِن شَكَرْتُمْ وَءَامَنتُمْ ۚ وَكَانَ ٱللَّهُ شَاكِرًا عَلِيمًا
[146-147] As regards those of them, who repent and mend them ways and then hold fast to Allah and dedicate their religion sincerely to Allah,174 such people are with the Believers, and Allah will most surely bestow a great reward on the Believers. And why should Allah punish you, if you are grateful175 and behave like true Believers? For Allah fully appreciates worth176 and knows everything about everyone.
174That person, who dedicates his Faith to Allah, devotes his whole life earnestly and faithfully for Him and reserves all his loyalties, interests, and affections for Him alone. In short, his attachment to Allah becomes so intense that he is ready to sacrifice anything for Him.
175That is, "If you show your sincere gratitude to Allah and do not adopt an attitude of ingratitude and treachery towards Him in regard to the benefits and blessings you have received from Him, there is no reason why He should punish you for nothing."
The right attitude of gratitude is that one should sincerely appreciate the kindness of the benefactor, acknowledge it with his tongue and show his gratitude by his conduct. This implies three things: First, the grateful person should attribute the kindness to the real benefactor and should not associate anyone else with him in gratitude and acknowledgment. Second, he should be full of the feelings of love and loyalty for his benefactor and should not cherish any such feelings for the opponents of the benefactor. Third, he should be obedient to his benefactor, and should not in any way use or employ the benefits conferred on him against the will of the benefactor.
176The word shakir, when applied to Allah, means that He appreciates the worth of the services of His servant; and when applied to the servant, it means that he expresses his gratitude to his Lord for His blessings. Allah appreciates fully the quantity and the quality of the services that are rendered by His servants for His cause and deprives none of them of the due rewards: nay, He rewards their services most generously and gives much more than they deserve. Of course, His treatment of His servants is quite different from their own treatment of their fellow-men. They under-estimate the worth of the services rendered by a fellow- man and take him to task severely for an omission. Allah in His bounty rewards much more generously than His servant deserves for any service rendered by him in His cause, but is very lenient and forgiving for any omission or neglect of duty shown by His servants.