A man prayed the voluntary prayer before the Zuhr prayer, then a group came and appointed him as their imam, so he changed his intention from voluntary to obligatory
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Question:
He says: Honorable Shaykh, may Allah grant you success. A man prayed the voluntary prayer before the Zuhr prayer, then a group came and thought he was praying Zuhr, so they appointed him as their imam. He stepped forward and changed his intention from voluntary to the Zuhr prayer. What is required of him?
Answer:
One does not change a voluntary prayer into an obligatory one. The reverse is permissible: changing an obligatory prayer into a voluntary one. But the reverse is not allowed; one does not change a voluntary prayer into an obligatory one. So his action is not correct.
He says: Honorable Shaykh, may Allah grant you success. A man prayed the voluntary prayer before the Zuhr prayer, then a group came and thought he was praying Zuhr, so they appointed him as their imam. He stepped forward and changed his intention from voluntary to the Zuhr prayer. What is required of him?
Answer:
One does not change a voluntary prayer into an obligatory one. The reverse is permissible: changing an obligatory prayer into a voluntary one. But the reverse is not allowed; one does not change a voluntary prayer into an obligatory one. So his action is not correct.
Source
قناة «العلامة الدكتور صالح الفوزان»، [335 -939] رجل صلى النافلة قبل صلاة الظهر، فجاء جماعة فقدموه إماما لهم، فقلب نيته من نفل إلى فرض.. — youtube.com
The Arabic text is a machine transcription of the audio recording.