Quran 6:61 from Surah Al-An'aam on Divine Marvels.
وَهُوَ ٱلۡقَاهِرُ فَوۡقَ عِبَادِهِۦۖ وَيُرۡسِلُ عَلَيۡكُمۡ حَفَظَةً حَتَّىٰٓ إِذَا جَآءَ أَحَدَكُمُ ٱلۡمَوۡتُ تَوَفَّتۡهُ رُسُلُنَا وَهُمۡ لَا يُفَرِّطُونَ
English translation: And He (is) the Subjugator over His slaves and He sends over you guardians until when comes (to) anyone of you the death take him Our messengers and they (do) not fail
Transliteration: wahuwa al-qahiru fawqa ibadihi wayur'silu alaykum hafazatan hatta idha jaa ahadakumu al-mawtu tawaffathu rusuluna wahum la yufarrituna