The ruling on combining two prayers when an obligatory prayer is performed between them

Question : Now, what if an obligatory prayer is performed between them? What if an obligatory prayer is performed between them?

Answer : It is possible. After he finished the Maghrib prayer, he remembered that he had prayed the Asr prayer without performing wudu. So he prayed the Asr prayer, and there is no combining, because if the combining is invalidated by the rawatib (regular voluntary prayers) attached to the combined prayer, then its invalidation by a foreign prayer is even more so. Now,