From Sahih Muslim (Hadith 5233):
Sahl b. Sa'd reported that Abu Usaid al-Sa'idi invited Allah's Messenger (ﷺ) to his wedding feast, and his wife had been serving them on that day while yet a bride. Sahl said ' Do you know what she served as a drink to Allah's Messenger (ﷺ)? She steeped the dates in water during the night in a big bowl, and when he (the Holy Prophet) had eaten food she served him this drink
Reference: Muslim 5233