Ruling 748 — Prayer (Ṣalāh)

If a person performs a prayer and then performs it again as a precautionary measure, and during the prayer he remembers that he has not performed the prayer that was necessary for him to perform before it, he cannot change his intention to that prayer. For example, if when he performs the ʿaṣr prayer as a precautionary measure he remembers he has not performed the ẓuhr prayer, he cannot change his intention to the ẓuhr prayer.