How to respond to those who argue for the permissibility of celebrating the Prophet's birthday by citing the Prophet's (peace and blessings be upon him) answer when asked about fasting on Monday, in which he said:

The questioner : May Allah reward you. He says: O honorable Shaykh, the argument of those who celebrate the Prophet's (peace and blessings be upon him) birthday is that when he was asked about fasting on Monday, he said, to the effect of: ? What is your opinion?

The Shaykh : Yes, we say our opinion is upon our eyes and heads: Fast on Monday. Who prevents you from fasting on Monday? Fast on Monday as the Messenger of Allah (peace and blessings be upon him) said: They do not care about Monday; they celebrate on the night of the twelfth of Rabi' al-Awwal, whether it is Monday, Tuesday, or any other day. Moreover, historically, the birth of the Messenger of Allah (peace and blessings be upon him) was not on the twelfth day. This is what astronomers have established, stating that the closest date is that he was born on the ninth day. And we say that even if it were historically established that he was born on the twelfth day, celebrating it in the manner we described earlier is a religious innovation (bid'ah), which only increases a person's distance from Allah, may Allah protect us from that, because it introduces into the religion of Allah what is not part of it.