Someone validly performs Asr while genuinely unaware of a missed Zuhr, then recalls Zuhr afterwards. The Zuhr must be made up; the earlier forgetfulness prevents automatically invalidating Asr on sequencing grounds.
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A missed prayer recalled later
Making Up Missed Prayers: Obligation and Sequence
Someone validly performs Asr while genuinely unaware of a missed Zuhr, then recalls Zuhr afterwards. The Zuhr must be made up; the earlier forgetfulness prevents automatically invalidating Asr on sequencing grounds.