Shared foundation: asking for rain and seeking forgiveness are legitimate.
Abu Hanifah: no fixed congregational prayer and attached sermon is recognized as a specific sunnah; individual prayer is permitted.
Abu Yusuf and Muhammad: a prophetic report supports the two-unit congregational prayer with audible recitation and its accompanying sermon and supplication.
The difference is the formal ritual prescription, not whether people may seek rain.
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Salat al-Istisqa: Supplication for Rain and Juristic Rulings
Shared foundation: asking for rain and seeking forgiveness are legitimate.
Abu Hanifah: no fixed congregational prayer and attached sermon is recognized as a specific sunnah; individual prayer is permitted.
Abu Yusuf and Muhammad: a prophetic report supports the two-unit congregational prayer with audible recitation and its accompanying sermon and supplication.
The difference is the formal ritual prescription, not whether people may seek rain.