سِرّهُمْ
Appears 2 times in the Quran.
(Root: سرر)
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9:78 أَلَمْ يَعْلَمُوٓا۟ أَنَّ ٱللَّهَ يَعْلَمُ سِرَّهُمْ وَنَجْوَىٰهُمْ وَأَنَّ ٱللَّهَ عَلَّٰمُ ٱلْغُيُوبِ
Do they not know that Allah knows their hidden thoughts and their secret counsels, and that Allah is the great Knower of the unseen things?
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43:80 أَمْ يَحْسَبُونَ أَنَّا لَا نَسْمَعُ سِرَّهُمْ وَنَجْوَىٰهُم بَلَىٰ وَرُسُلُنَا لَدَيْهِمْ يَكْتُبُونَ
Or do they think that We do not hear what they conceal and their secret discourses? Aye! and Our messengers with them write down.