Jami` at-Tirmidhi 2035
جامع الترمذي#2035Da'ifUsamah bin Zaid narrated that the Messenger of Allah (s.a.w) said:"Whoever some good was done to him, and he says: 'May Allah reward you in goodness' then he has done the most that he can of praise
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan
Zubair Ali ZaiDaif
In-book reference: 27:141