Reciting “لا يؤمنون” instead of “لا يوقنون”

Question

If a person praying alone, in the second rukū‘ section of Sūrah al-Ṭūr, recites “بل لا يؤمنون” instead of “بل لا يوقنون”, will his prayer be valid?

Answer

If this was done by mistake or forgetfulness, the prayer will not be invalidated.

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