The ruling on reciting without sound

Question

If someone recites in the prayer so quietly that he himself cannot hear [it], is his prayer valid without dislikedness (karaha)?

Answer

If he recited so quietly that the letters were pronounced correctly but the sound was not heard at all, then according to al-Karkhi ﵀ and Abu Bakr al-Balkhi ﵀ the prayer was validly performed, while according to al-Hinduwani ﵀ and Fadl ﵀ it was not valid, because in their view merely pronouncing the letters correctly is not sufficient; rather, it is also necessary that the…

Source: Fatawa Mahmudiyya

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