مناسك حج - مكارم شيرازى، ناصر - الصفحة ٢١٩ - Miscellaneous Issues of Hajj

are sure that they can return on time for performing the rituals of Hajj. And it is obligatory precaution for them to become Muhrim to Ihram of Hajj when they want to leave and remain Muhrim until performing the acts of Hajj; but if this act causes severe hardness then they can leave without Ihram.

Article ٣٥١- Whenever a person goes out of Mecca for performing a task after completion of Umrah, Ihram is not obligatory for him/ her if he/ she returns in the same month( for example the pilgrim performs Umrah al- Tamattu in the beginning of Dhul- Qadah and depart Mecca for Jeddah or other places and return in the same month of Dhul- Qadah ), but he/ she should become Muhrim if he/ she returns in the next month and performs Umrah again and this will be considered as his/ her Umrah al- Tamattu and it is precaution to perform a Tawaf of Nisa and its prayer for the previous Umrah.

Article ٣٥٢- Being in a roofed vehicle in the city of Mecca in the state of Ihram has no problem( in say or night )but it is better to observe the precaution in the place that is out of Haram) that side which is beyond Masjid al- Taneem (.