The month of Rajab is a sacred month
The Sacred months have a special status, which applies also to Rajab because it is one of these sacred months. Allah says (interpretation of the meaning):
“O you who believe! Violate not the sanctity of the Symbols of Allah, nor of the Sacred Month…” [al-Maa’idah 5:2]
This means: do not violate their sanctity which Allah has commanded you to respect and forbidden you to violate, for this prohibition includes both vile deeds and vile beliefs.
Allah says (interpretation of the meaning):
“so wrong not yourselves therein…” [al-Tawbah 9:36] meaning, in the Sacred Months.
The pronoun here [translated here as “therein”] refers to these four sacred months, as stated by the Imam of the Mufassireen, Ibn Jareer al-Tabari (R.A).
So we should pay attention to the sanctity of these four months, because Allah has singled them out for a special status and has forbidden us to commit sins out of respect for their sanctity, for sins committed at this time are even worse, because of the sanctity of the time which Allah has made sacred.
Hence in the aayah quoted above, Allah has forbidden us to wrong ourselves even though this – i.e., wronging ourselves, which includes committing sins – is forbidden
during all the months of the year.
Source: islamqa.info/en
