Celebrating the Prophet's birthday is an innovation

Allaah The Almighty Says (what means): {Say, [O Muhammad], "If you should love Allaah, then follow me, [so] Allaah will love you and forgive you your sins.} [Quran 3:31] In a Hadeeth (narration) on the authority of ‘Aa’ishah the Prophet (peace and blessings of Allaah be upon him)  said that whoever introduces something new to Islam which does not belong to it, it will be rejected and Allaah The Almighty will not accept it from him. [Al-Bukhaari and Muslim]

In a Hadeeth on the authority of Jaabir ibn Abd Allaah  the Prophet (peace and blessings of Allaah be upon him) used to mention in his sermons that the best of sayings is the Book of Allaah The Almighty, and the best of guidance is that of Muhammad and the worst of matters is innovations in religion and that every religious innovation is misguidance. [Muslim]

It was not authentically narrated from the Prophet (peace and blessings of Allaah be upon him)  or the rightly-guided Caliphs that they celebrated the birthday of the Prophet (peace and blessings of Allaah be upon him) or did anything to that effect. If the celebration of his birthday was a good thing, they would have done that before anyone else. In the spirit of observing the noble Sunnah (tradition) and abiding by the Quran, Muslims should not introduce any matter that does not belong to the Book of Allaah, the Quran, or the Sunnah of the Prophet .

If they were to do so, they would fail to apply his Sunnah and convey his message, while occupying themselves with trivial matters. It is not permissible for any Muslim, irrespective of his status, to propagate religious innovations or practice them, for this was the norm of the righteous predecessors of this Ummah, and affirmed by the diligent and prominent Imaams  all.

Finally, we implore Allaah The Almighty to guide us to follow in their footsteps and hold fast to the straight path without addition or deletion. Allaah The Almighty is the guide to success.