Rajab is one of the four sacred months. It stands alone, unlike the other three (Dhu’l-Qa`dah, Dhu’l-Hijjah and Muharram) which come one after the other. The Messenger of Allah ﷺ himself would venerate this month. When the month entered he would seek its blessings, saying:
اللَّهُمَّ بَارِكْ لَنَا في رَجَبٍ وَ شَعْبَانَ وَ بَلِّغْنا رَمَضَانَ
Allahumma barik lana fi Rajabin wa Sha`ban wa ballighna Ramadan
“O Allah bless us in Rajab and Sha`ban and enable us to reach Ramadan!”1
Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
Is it recommended to fast on the day after the night of the Isra and Mi’raj (27th Rajab)?
Generally speaking fasting in the sacred months is better than fasting in the other months. There is a sound hadith in which Ibn Umar was asked whether the Prophet ﷺ used to fast in Rajab. He said: “Yes, and he would ennoble it (meaning the month of Rajab).” Some of the pious recommend fasting on the day of the Isra and Mi’raj but it is not something that has been directly narrated on the authority of the Prophet ﷺ . Above all, we should seek a true connection with the Prophet, the one who was taken on the Isra and Mi`raj.
Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him).
What should we do on the night of the Isra and Mi’raj?
Nothing specific is prescribed on that night. However, if you hold a gathering, you should talk about the Prophet ﷺ and the Mi’raj and pray for the Ummah in abundance. Fasting on the following day (27th Rajab) is also good. Rewards for doing so are mentioned in some narrations. Although these narrations are weak, fasting is generally recommended in the sacred months, of which Rajab is one.