Prayer: Time for Maghrib and Isha Prayers
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 723
For a person under normal circumstances, the time for the maghrib prayer is until midnight, but for a helpless person, who, due to forgetfulness, oversleeping, menstruation (ḥayḍ), or suchlike, did not perform prayers before midnight, the time for maghrib and ʿishāʾ prayers is extended until dawn. However, in both cases, the proper order between the two prayers must be observed, meaning that if the ʿishāʾ prayer is knowingly performed before the maghrib prayer, it is invalid unless the time remaining is sufficient for performing only the ʿishāʾ prayer, in which case it is necessary that one perform the ʿishāʾ prayer before the maghrib prayer.