Mishkat al-Masabih #1900
Fasting
Anas said that the Prophet used to break his fast before praying with some fresh dates, but if there were no fresh dates he had a few dry dates, and if there were no dry dates he took some mouthfuls* of water.
*Mirqat explains this as three mouthfuls, but 'three' does not occur in the text.
Tirmidhi and Abu Dawud transmitted it, Tirmidhi saying that this is a hasan gharib tradition.
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About Mishkat al-Masabih
This hadith is #1900 from Mishkat al-Masabih, in the Book of Fasting. Mishkat al-Masabih contains 4,428 hadiths across 25 books.