Sura Āl-ʿImrān 3:144

وَمَا مُحَمَّدٌ إِلَّا رَسُولٌ قَدْ خَلَتْ مِن قَبْلِهِ ٱلرُّسُلُ أَفَإِي۟ن مَّاتَ أَوْ قُتِلَ ٱنقَلَبْتُمْ عَلَىٰٓ أَعْقَٰبِكُمْ وَمَن يَنقَلِبْ عَلَىٰ عَقِبَيْهِ فَلَن يَضُرَّ ٱللَّـهَ شَيْـًٔا وَسَيَجْزِى ٱللَّـهُ ٱلشَّٰكِرِينَ

wa-mā muḥammadun illā rasūlun qad khalat min qablihi l-rusulu a-fa-īn māta aw qutila inqalabtum ʿala aʿqābikum wa-man yanqalib ʿalā ʿaqibayhi fa-lan yaḍurra allāha shayʾan wasayajzī allāhu l-shākirīna

Muhammad is no more than a messenger: many Were the messenger that passed away before him. If he died or were slain, will ye then Turn back on your heels? If any did turn back on his heels, not the least harm will he do to Allah; but Allah (on the other hand) will swiftly reward those who (serve Him) with gratitude.