In the name of Allah

Celebration of Prophet birth day is Bidah (Any innovated practice in religion) Birthday Celebration is not allowed for Islam

1
Allah's Apostle said, "If somebody innovates something which is not in
harmony with the principles of our religion, that thing is rejected."

Sahih Al-Bukhari Hadith Hadith 3.861
Narrated by Aisha

2
When Allah's Messenger (peace be upon him) Said :"The best speech is that
embodied in the Book of Allah, and the best guidance is the guidance given
by Muhammad. The most evil affairs are their innovations; and every innovation is an error.

Sahih Muslim Hadith Hadith 1885
Narrated by Jabir ibn Abdullah

3
Allah's Messenger (peace be upon him) said: He who revived a Sunnah out of
my Sunan, which has died after me, for him is the reward like the reward of
those who acted upon it, without any decrease in that reward. He who
introduced some evil innovation which Allah and His Messenger did not
approve has (a burden of sin upon him) like the sins of one who acted
according to it, without their sins being mitigated thereby in the least.
Transmitted by Tirmidhi.

Al-Tirmidhi Hadith Hadith 168
Narrated by Bilal ibn Harith al-Muzani

4
I heard the Prophet saying, "Do not exaggerate in praising me as the
Christians praised the son of Mary, for I am only a slave. So, call me the
Slave of Allah and His Apostle."

Sahih Al-Bukhari Hadith Hadith 4.654
Narrated by Umar

5
Allah Messenger (Peace be upon Him) Said: Do not take my grave as a place of habitual ceremony.

Source: Abu Dawud 2 / 218

6
Whatsoever the Messenger ( Muhammad ) gives you , take it , and whatsoever
he forbids you , abstain ( from it )

AlQuraan 59 / 7