Luqman 31:23 ومن كفر فلا يحزنك كفره الينا مرجعهم فننبيهم بما عملوا ان الله عليم بذات الصدور ٢٣
وَمَن
كَفَرَ
فَلَا
يَحۡزُنكَ
كُفۡرُهُۥٓۚ
إِلَيۡنَا
مَرۡجِعُهُمۡ
فَنُنَبِّئُهُم
بِمَا
عَمِلُوٓاْۚ
إِنَّ
ٱللَّهَ
عَلِيمُۢ
بِذَاتِ
ٱلصُّدُورِ
٢٣
As for those who refuse to do this, do not let their refusal sadden you [Prophet]- they will return to Us and We shall tell them what they have done: God knows all that hearts contain-
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Ibn Kathir (Abridged)
وَهُوَ مُحْسِنٌ
(while he is a Muhsin) i.e., doing what his Lord has commanded and abstaining from what He has forbidden,
فَقَدِ اسْتَمْسَكَ بِالْعُرْوَةِ الْوُثْقَى
(then he has grasped the most trustworthy handhold.) means, he has received a firm promise from Allah that He will not punish him.
وَإِلَى
…وَهُوَ مُحْسِنٌ
(while he is a Muhsin) i.e., doing what his Lord has commanded and abstaining from what He has forbidden,
فَقَدِ اسْتَمْسَكَ بِالْعُرْوَ
…