Sunan Abi Dawud Book 28, Hadith 100
The Prophet(ﷺ) used to eat cucumber with fresh dates
The Messenger of Allah(ﷺ) prohibited anyone taking two dates together with the exception that you ask permission from your companions.
The Messenger of Allah (ﷺ) used to eat melon with fresh dates, and he used to say: The heat of the one is broken by the coolness of the other, and the coolness of the one by the heat of the other.