Verily, those who disbelieve, and hinder (men) from the Path of Allâh (i.e. Islâm), and oppose the Messenger ( SAW) (by standing against him and hurting him), after the guidance[] has been clearly shown to them, they will not hurt Allâh in the least, but He will make their deeds fruitless.
Surah Muhammad-032
Saying of Prophet Muhammad (SAW)
The Holy Prophet (PBUH) observed: "I am Muhammad, I am Ahmad, I am the effacer and infidelity shall be erased through me; I am the assembler. People shall be assembled on Doomsday after my time. (In other words Doom is my only successor.) And I am the last in the sense that no prophet shall succeed me."