How does one pray a vow of fifty rak'ahs?
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Question:
A man vowed to pray fifty rak'ahs, so he prayed every ten of them with a single taslim. The question is: should he repeat them, making each two rak'ahs with a taslim?
Answer:
Yes. If it is during the day, this may be permissible. As for the night, the night prayer is prayed in pairs of two. The night prayer is prayed in pairs of two. Unless he specified, saying, "Pray them with a single taslim." If he specified, saying, "Pray them with a single taslim," then he prays them with a single taslim. But if he did not specify, he reverts to the default ruling of the Shari'ah, which is that the night prayer is prayed in pairs of two. So he repeats it a second time. Yes.
A man vowed to pray fifty rak'ahs, so he prayed every ten of them with a single taslim. The question is: should he repeat them, making each two rak'ahs with a taslim?
Answer:
Yes. If it is during the day, this may be permissible. As for the night, the night prayer is prayed in pairs of two. The night prayer is prayed in pairs of two. Unless he specified, saying, "Pray them with a single taslim." If he specified, saying, "Pray them with a single taslim," then he prays them with a single taslim. But if he did not specify, he reverts to the default ruling of the Shari'ah, which is that the night prayer is prayed in pairs of two. So he repeats it a second time. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، كيف يصلي من نذر صلاة خمسين ركعة؟ للشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.