Jami` at-Tirmidhi 3731
جامع الترمذي#3731SahihNarrated Sa'd bin Abi Waqqas:that the Prophet (ﷺ) said to 'Ali, "You are to me, in the position that Harun was to Musa, [except that there is no Prophet after me]
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 Sahih
Zubair Ali ZaiSahih
In-book reference: 49:128