Jami` at-Tirmidhi 656
جامع الترمذي#656SahihBahz bin Hakim narrated from his father, from his grandfather who said:"When something was brought to him, the Messenger of Allah would ask: 'Is this charity or a gift?' If they said: 'Charity.' He would not eat it, and if they said, 'A gift' he would eat it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan Sahih
Al-AlbaniHasan Sahih
Bashar Awad MaaroufHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 7:40