Sunan Abi Dawud, Book 13, Hadith 2348 (USC-MSA) ⓘ
Narrated Salman ibn Amir: The Prophet said: When one of you is fasting, he should break his fast with dates; but if he cannot get any, then (he should break his fast) with water, for water is purifying.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ، عَنْ عَاصِمٍ الأَحْوَلِ، عَنْ حَفْصَةَ بِنْتِ سِيرِينَ، عَنِ الرَّبَابِ، عَنْ سَلْمَانَ بْنِ عَامِرٍ، عَمِّهَا قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا كَانَ أَحَدُكُمْ صَائِمًا فَلْيُفْطِرْ عَلَى التَّمْرِ فَإِنْ لَمْ يَجِدِ التَّمْرَ فَعَلَى الْمَاءِ فَإِنَّ الْمَاءَ طَهُورٌ " .
also referenced under: Hadith 2355 (DarusSalam) & Hadith 2348 (Hasan)