Al-Shafi‘i regards sequence in makeup prayers as Sunnah rather than a condition of validity. He reasons that each obligatory prayer is a distinct act whose validity need not depend on another.
The Hanafi reasoning treats the ordered Prophetic performance and the prescribed prayer sequence as grounds for an obligatory order.
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Making Up Missed Prayers: Obligation and Sequence
Al-Shafi‘i regards sequence in makeup prayers as Sunnah rather than a condition of validity. He reasons that each obligatory prayer is a distinct act whose validity need not depend on another.
The Hanafi reasoning treats the ordered Prophetic performance and the prescribed prayer sequence as grounds for an obligatory order.