Jami` at-Tirmidhi 3761
جامع الترمذي#3761SahihNarrated Abu Hurairah:that the Prophet (ﷺ) said: "Al-'Abbas is the uncle of the Messenger of Allah (ﷺ), and indeed, the uncle of a man is the Sinw of his father or from the Sinw of his father
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
Zubair Ali ZaiSahih Muslim
In-book reference: 49:160