What is the ruling on someone who blasphemes the Prophet, sallallaahu ‘alayhi wa sallam? If he repents will his repentance be accepted, or should he be killed for apostasy?

All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.

If a Muslim commits blasphemy against the Prophet, sallallaahu ‘alayhi wa sallam, this is an act of disbelief which takes him out of the fold of Islam. Allaah Says (what means): {Make no excuse; you have disbelieved [i.e. rejected faith] after your belief. If We pardon one faction of you—We will punish another faction because they were criminals.}[Quran 9:66] If joking is considered as an act of apostasy, then it is more confirmed for one who is saying it intentionally.

If the blasphemer does not repent, he should be killed for his apostasy. However, if he sincerely repents to Allaah, Allaah will accept his repentance.

Repentance expiates all sins, even Shirk (associating partners to Allaah).

Allaah Knows best.