Sunan At-Tirmidhi
Hadith #1814
Narrated Ibn 'Umar: ""The Messenger of Allah (ﷺ) prohibited taking two dates at a time until seeking permission from one's companion."" He said: There is something on this topic from Sa'd the freed slave of Abu Bakr. [Abu 'Eisa said:] This Hadith is Hasan Sahih