The Hanafi school classifies prostration of recitation as wajib, arising through recitation or hearing. Imam al-Shafi'i and Imam Malik classify it as sunnah.
The disagreement concerns the legal degree of the demand, not whether the act is part of the religion.
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Prostration of Recitation: Locations, Obligation, Hearing and Performance
The Hanafi school classifies prostration of recitation as wajib, arising through recitation or hearing. Imam al-Shafi'i and Imam Malik classify it as sunnah.
The disagreement concerns the legal degree of the demand, not whether the act is part of the religion.