Mishkat al-Masabih #1920
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ بَعْضِ أَصْحَابِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: لَقَدْ رَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِالْعَرْجِ يَصُبُّ عَلَى رَأْسِهِ الْمَاءَ وَهُوَ صَائِمٌ مِنَ الْعَطَشِ أَوْ مِنَ الْحَرِّ. رَوَاهُ مَالك
One of the Prophet’s companions said he had seen the Prophet in al-'Arj* pouring water over his head while he was fasting; either because of thirst or because of the heat.
*A wadi in the neighbourhood of at-Ta’if.
Malik and Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #1920 from Mishkat al-Masabih, in the Book of Fasting.