A man prayed the night prayer (qiyam al-layl) two rak'ahs, two rak'ahs, then prayed three rak'ahs in succession with one tashahhud!
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Question:
A questioner says: If I pray two rak'ahs, then say the taslim, then pray two rak'ahs, then say the taslim, then pray two rak'ahs, then say the taslim, then pray three rak'ahs in succession, does this act count as witr with nine rak'ahs or with three rak'ahs?
Answer:
This is witr, but it includes a taslim after every two rak'ahs. It combines both matters: the taslim and the continuous recitation. All of this is permissible. Yes.
A questioner says: If I pray two rak'ahs, then say the taslim, then pray two rak'ahs, then say the taslim, then pray two rak'ahs, then say the taslim, then pray three rak'ahs in succession, does this act count as witr with nine rak'ahs or with three rak'ahs?
Answer:
This is witr, but it includes a taslim after every two rak'ahs. It combines both matters: the taslim and the continuous recitation. All of this is permissible. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 286- رجل صلى القيام ركعتين ركعتين ثم صلى ثلاث ركعات سردا بتشهد واحد !| الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.