لِ، بِ، مِنْ، لَا، مَا، أَنْ، إنْ etc. harf sometimes come as extra. These do not have grammatical significance but sometimes come to emphasize.
Your Lord is not unjust to the slaves. |
وَمَا رَبُّكَ بِظَلَّامٍ لِّلْعَبِيدِ |
Then |
بِ |
I destroyed many populations. |
وَكَم مِّن قَرْيَةٍ أَهْلَكْنَاهَا |
So |
مِنْ |
By the grace of Allah you have become soft hearted for them |
فَبِمَا رَحْمَةٍ مِّنَ اللَّهِ لِنتَ لَهُمْ |
that |
مَا |
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