Narrated 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]." (AR)
English reference (AR): Vol. 1, Book 46, Hadith 3730 (AR)
Arabic reference (AR): Book 49, Hadith 4096 (AR)