Allah's Apostle said, "If anyone of you feels drowsy while praying he should go to bed (sleep) till his slumber is over because in praying while drowsy one does not know whether one is asking for forgiveness or for a bad thing for oneself."
— Sahih Bukhari, Volume 1, Book 4: Ablutions (Wudu'), Hadith #211
Allah's Apostle said, "If anyone of you feels drowsy while praying he should go to bed (sleep) till his slumber is over because in praying while drowsy one does not know whether one is asking for forgiveness or for a bad thing for oneself."
This hadith is from the book of Ablutions (Wudu') in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 211 in book 4 of volume 1.
This hadith is referenced in the following topics: How to Pray.
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