Mishkat al-Masabih 7 Fasting كتاب الصوم 35

وَعَنْ أَنَسٍ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُفْطِرُ قَبْلَ أَنْ يُصَلِّيَ عَلَى رطبات فَإِن لم تكن فتميرات فإنلم تكن تُمَيْرَات حسى حَسَوَاتٍ مِنْ مَاءٍ. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ. وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ حَسَنٌ غَرِيب

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.