Hanafi jurists allow multiple obligatory prayers with one valid tayammum. Al-Shafi‘i limits its use for obligatory prayers in a different way, generally requiring a fresh tayammum for another obligatory prayer.
The disagreement concerns whether tayammum functions like continuing ritual purification or as permission tied more narrowly to particular obligatory prayer performance.
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Tayammum Materials, Intention, Nullifiers, and Searching for Water
Hanafi jurists allow multiple obligatory prayers with one valid tayammum. Al-Shafi‘i limits its use for obligatory prayers in a different way, generally requiring a fresh tayammum for another obligatory prayer.
The disagreement concerns whether tayammum functions like continuing ritual purification or as permission tied more narrowly to particular obligatory prayer performance.