وَمَا مُحَمَّدٌ إِلاَّ رَسُولٌ قَدْ خَلَتْ مِن قَبْلِهِ الرُّسُلُ أَفَإِن مَّاتَ أَوْ قُتِلَ انقَلَبْتُمْ عَلَى أَعْقَابِكُمْ وَمَن يَنقَلِبْ عَلَىَ عَقِبَيْهِ فَلَن يَضُرَّ اللّهَ شَيْئًا وَسَيَجْزِي اللّهُ الشَّاكِرِينَ
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سورة آل عمران
(3/144) And Muhammad is no more then a Messenger, and Messengers have passed away before him as well. If he dies or is killed, will you then turn back on your heels? And whoever turns back upon his heels, he will by no means do harm to Allah in the least; and Allah will reward the grateful soon.
Surah Al Imran