It is narrated from Sayyiduna Irbad bin Sariyah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When a man gives water to his wife to drink, he receives reward." When I heard this hadith, I got up, gave water to my wife, and narrated this hadith to her.
Hadith Referenceسلسله احاديث صحيحه / الزواج ، والعدل بين الزوجات وتربية الاولاد والعدل بينهم وتحسين اسمائهم / 1449