Bukhari :: Book 3 :: Volume 31 :: Hadith 184
'Narrated Abu Sa'id:
That he had heard the Prophet saying, "Do not fast continuously (practise Al-Wisal), and if you intend to lengthen your fast, then carry it on only till the Suhur (before the following dawn)." The people said to him, "But you practice (Al-Wisal), O Allah's Apostle!" He replied, "I am not similar to you, for during my sleep I have One Who makes me eat and drink."
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