مناسك حج - مكارم شيرازى، ناصر - الصفحة ٥٠ - Rulings of Miqats

٢- Person who wants to perform Umrah of month of Rajab and has the fear that month ends before reaching Miqat can become Muhrim before Miqat and it is permitted for him in order not to lose the superiority and benefit of Umrah of month of Rajab.

Article ٥٦- Reaching to Miqat should be proved by certainty, or confidence or famousness among people of the region, or at least by testification of an impartial person, and it is not permitted to wear Ihram in doubt( except by performing Nazr in the way that mentioned in past article ).

Article ٥٧- It is not permitted for a person to pass Miqat without Ihram unless there is another Miqat in the way that in this case Ihram from the second Miqat is correct, although it is better to become Muhrim from the first Miqat as obligatory precaution.

Article ٥٨- Whenever a person passes Miqat without Ihram deliberately and aware then he/ she should return to Miqat and become Muhrim, and if it is not possible for him/ her to return then his Hajj is invalidated and should perform it the next year.