ثُمَّ أَنَزلَ اللّهُ سَكِينَتَهُ عَلَى رَسُولِهِ وَعَلَى الْمُؤْمِنِينَ وَأَنزَلَ جُنُودًا لَّمْ تَرَوْهَا وَعذَّبَ الَّذِينَ كَفَرُواْ وَذَلِكَ جَزَاء الْكَافِرِينَ
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سورة التوبة
(9/26) Then Allah did send down His Sakînah (calmness, tranquility and reassurance) upon His Messenger and upon the believers. And sent down an army which you could not see and tormented those who disbelieved. And that is the punishment of the disbelievers.
Surah At-Tawbah