Importance of the Month of Rajab:
The month of Rajab is one of the sacred months. Allaah says (interpretation of the meaning):
“Verily, the number of months with Allaah is twelve months (in a year), so was it ordained by Allaah on the Day when He created the heavens and the earth; of them four are Sacred. That is the right religion, so wrong not yourselves therein”. (1)
The sacred months are: Rajab, Dhu’l-Qa3dah, Dhu’l-Hijjah and Muharram.
Fasting the month of Rajab:
There is no saheeh hadeeth to indicate that there is any special virtue in fasting all or part of this month.
What some people do, singling out some days of Rajab for fasting, believing that they are better than others, has no basis in sharee3ah.
There is a hadeeth that the Prophet SallAllaahu 3Alayhi wa Sallam said: “Fast some days of the sacred months and not others.” (2)
But it is classed as da3eef by Shaykh Al-Baani.
Even if this hadeeth were saheeh, it indicates that it is mustahabb to fast during the sacred months. So if a person fasts during Rajab because of this, and he also fasts in the other sacred months, there is nothing wrong with that. But singling out Rajab for fasting is not right.
Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) said:
As for fasting in Rajab in particular, the ahaadeeth concerning that are all da3eef (weak), and in fact mawdoo3 (fabricated). The scholars do not rely on any of them. They are not among the da3eef ahaadeeth which have been narrated concerning virtues, rather most of them are fabricated and false.
In al-Musnad and elsewhere there is a hadeeth which says that the Prophet (peace and blessings of Allaah be upon him) enjoined fasting the sacred months, namely Rajab, Dhu’l-Qa’dah, Dhu’l-Hijjah and Muharram, but this has to do with fasting during all of them, not just Rajab. End quote. (3)
Ibn al-Qayyim (may Allaah have mercy on him) said:
“Every hadeeth which mentions fasting in Rajab and praying during some of its nights is false and fabricated.” (4)
Al-Haafiz ibn Hajar said: “There is no saheeh hadeeth that would count as evidence which speaks of the virtue of the month of Rajab, or that speaks of fasting this month or part of it, or of spending any particular night of it in prayer”. (5)
Shaykh Ibn 3Uthaymeen (Rahimahu-Allaah) said:
“There are some people who specify the month of Rajab with fasting all of it, and this is a bid3ah and not a sunnah, even Abu Bakr (Radi-Allaahu 3Anhu) he entered upon his household and saw that they have collected two pots of water in order to get ready for fasting Rajab so he broke the pots and said: “Do you want to change Rajab into Ramadaan? “
As for the one who was used to fasting Mondays and Thursdays or the White days then we say let him continue fasting them, And there is no specified fasting for the month of Rajab in particular.” (6)
Shaykh Sayyid Saabiq (may Allaah have mercy on him) said:
“Fasting in Rajab is no better than fasting in any other month, except that it is one of the sacred months. There is no report in the saheeh Sunnah to suggest that there is anything special about fasting in this month. Whatever has been narrated concerning that is not fit to be quoted as evidence” (7)
Fasting on 27th of Rajab:
Shaykh Ibn 3Uthaymeen (Rahimahu-Allaah) was asked about fasting on the twenty-seventh of Rajab and spending that night in prayer. He replied:
“Fasting on the twenty-seventh of Rajab and spending that night in prayer is a bid3ah (innovation), and every bid3ah is a going astray” (8)References: (1) Soorah At-Tawbah, v:36 (2) Abu Dawood 2428; classed as da3eef by al-Albaani in Da’eef Abi Dawood. (3) Majmoo3 al-Fataawa (25/290) (4) Al-Manaar al-Muneef, p. 96 (5) Tabyeen al-3Ajab (p. 11) (6) Fatwa fil-Hajj – 659 (7) Fiqh al-Sunnah (1/282) (8) Majmoo3 Fataawa Ibn 3Uthaymeen, 20/440.