Every day one lives is a day to be grateful to the Lord and a day of celebration and commemoration, Allah and His Messenger (saws) have nominated every Friday of the week, and the two days of Eid (Fitr and Adha) as days of special celebration and commemoration. The birth-day or death-day of any individual has absolutely no significance in the deen of Islam, and never ever did the Messenger of Allah (saws) celebrate his own birthday, nor did he ever celebrate the birthdays of his loved ones, nor did even his noble companions, who loved the Prophet (saws) more than anyone else, ever celebrate the birthday of their Noble Leader and Prophet (saws) during his (saws) life-time or after his (saws) death!
Therefore if someone starts the ritual of celebrating the Prophet’s (saws) or any others birthdays, thinking of it as a rite which will bring about the Pleasure or Good Will of Allah Subhanah, he will be inventing a thing in the deen of Islam which is not from the deen! And that is exactly what the Messenger of Allah (saws) termed as bidah or innovation; and every single innovation in the pure and perfect deen of Islam is an error, a sin, and absolutely detestable to the Lord Most Majestic.
Aisha narrated that the Messenger of Allah (saws) said: ‘If somebody innovates something which is not present in our religion, then that thing will be rejected.’
Related by Bukhari.
Sunan of Abu-Dawood Hadith 4515 Narrated by Ali ibn AbuTalib
That the Prophet of Allah (saws) said: “If anyone introduces an innovation (in religion), he will be responsible for it. If anyone introduces an innovation or gives shelter to a man who introduces an innovation (in religion), he is cursed by Allah, by His Angels, and by all the people.”
Sahih Muslim Hadith 1885 Narrated by Jabir ibn Abdullah
That the Prophet of Allah (saws) said in a sermon: “The best speech is that which is embodied in the Book of Allah, the Al Quran; and the best guidance is the guidance given by me, Mohamed (saws). The most evil affairs are the innovations, and every innovation is an error.”
The celebrating or commemorating of the birthday of the Noble Prophet (saws) is a clear and manifest bida, and the believers should fear Allah and absolutely abstain from this and all other innovations which have unfortunately crept into the pure and perfect deen of Islam…if indeed they fear Allah and the Last Day.