It wasnarrated from Sa'd, the freed slave of Abu Bakr – and Sa'dusedto serve the Messenger of Allah (ﷺ) and he liked this Hadith –that the Prophet (ﷺ) forbade eating two dates at once. (IT)
English reference (IT): Vol. 4, Book 29, Hadith 3332 (IT)
Arabic reference (IT): Book 29, Hadith 3457 (IT)