Quran 3:144 from Surah Aal-i-Imraan on Divine Marvels.
وَمَا مُحَمَّدٌ إِلَّا رَسُولٞ قَدۡ خَلَتۡ مِن قَبۡلِهِ ٱلرُّسُلُۚ أَفَإِيْن مَّاتَ أَوۡ قُتِلَ ٱنقَلَبۡتُمۡ عَلَىٰٓ أَعۡقَٰبِكُمۡۚ وَمَن يَنقَلِبۡ عَلَىٰ عَقِبَيۡهِ فَلَن يَضُرَّ ٱللَّهَ شَيۡـٔٗاۚ وَسَيَجۡزِي ٱللَّهُ ٱلشَّٰكِرِينَ
English translation: And not (is) Muhammad except a Messenger certainly passed away from before him [the] (other) Messengers So if he died or is slain will you turn back on your heels And whoever turns back on his heels then never will he harm Allah (in) anything And will reward Allah the grateful ones
Transliteration: wama muhammadun illa rasulun qad khalat min qablihi al-rusulu afa-in mata aw qutila inqalabtum ala a'qabikum waman yanqalib ala aqibayhi falan yadurra al-laha shayan wasayajzi al-lahu al-shakirina