Surat At-Tawbah - سورة التوبة

ثُمَّ أَنزَلَ اللَّهُ سَكِينَتَهُ عَلَىٰ رَسُولِهِ وَعَلَى الْمُؤْمِنِينَ وَأَنزَلَ جُنُودًا لَّمْ تَرَوْهَا وَعَذَّبَ الَّذِينَ كَفَرُوا ۚ وَذَٰلِكَ جَزَاءُ الْكَافِرِينَ

Muhsin Khan: Then Allah did send down His Sakinah (calmness, tranquillity and reassurance, etc.) on the Messenger (Muhammad SAW), and on the believers, and sent down forces (angels) which you saw not, and punished the disbelievers. Such is the recompense of disbelievers.