In some mosques, such as the Grand Mosque in Makkah, they pray ten taslims, with each imam praying five taslims.
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The questioner : O esteemed Shaykh! In some mosques, such as the Grand Mosque in Makkah, they pray ten taslims, with each imam praying five taslims. If I pray five with the first imam and then leave, will I be credited with standing in night prayer, or is it necessary to complete the prayer?
The Shaykh : It is necessary to complete the prayer, because the second imam is a deputy for the first. The evidence for this is that the witr is prayed with the second imam. Therefore, the first imam did not actually complete his prayer. Rather, he stood for part of the standing, and the other completed it. Yes.
The Shaykh : It is necessary to complete the prayer, because the second imam is a deputy for the first. The evidence for this is that the witr is prayed with the second imam. Therefore, the first imam did not actually complete his prayer. Rather, he stood for part of the standing, and the other completed it. Yes.