Qur'an 6:61 · Al-An'aam

وَهُوَ ٱلْقَاهِرُ فَوْقَ عِبَادِهِۦ ۖ وَيُرْسِلُ عَلَيْكُمْ حَفَظَةً حَتَّىٰٓ إِذَا جَآءَ أَحَدَكُمُ ٱلْمَوْتُ تَوَفَّتْهُ رُسُلُنَا وَهُمْ لَا يُفَرِّطُونَ

(61) And He is the subjugator over His servants, and He sends over you guardian-angels until, when death comes to one of you, Our messengers [i.e., angels of death] take him, and they do not fail [in their duties].