Abu Qatadah (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "He who serves others with drinking water should be the last to drink himself."[At-Tirmidhi]. (JA)
App reference (JA): Book 3, Hadith 46 (JA)
Arabic/English book reference (JA): Book 3, Hadith 773 (JA)