Sahih Muslim Book 003, Hadith Number 0732.

Chapter : Ablution does not break by dozing in a sitting posture.

Anas b. Malik reported: (The people) stood up for prayer and the Apostle of Allah (may peace be upon him) was talking in whispers with a man, and he did not discontinue the conversation till his Companions dozed off; he then came and led the prayer.

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