Ruling on changing the intention during prayer to another prayer
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Q286: The questioner asks: What is the ruling on changing the intention during prayer to another prayer?
A286: It is not permissible to change during the prayer to another prayer by changing the intention, because that invalidates the prayer. So one remains with his original intention, except if he entered the obligatory prayer and it became clear to him that its time had not yet begun, or that he is praying alone in the presence of a congregation. In that case, he changes it to a voluntary prayer, then prays with the congregation. Or he changes the prayer he started before its time to a voluntary prayer, and when the time enters, he prays the obligatory prayer.
A286: It is not permissible to change during the prayer to another prayer by changing the intention, because that invalidates the prayer. So one remains with his original intention, except if he entered the obligatory prayer and it became clear to him that its time had not yet begun, or that he is praying alone in the presence of a congregation. In that case, he changes it to a voluntary prayer, then prays with the congregation. Or he changes the prayer he started before its time to a voluntary prayer, and when the time enters, he prays the obligatory prayer.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.