Hadithcore
Musnad Ahmad 1547
sahih

It was narrated from Sa’d that the Prophet (ﷺ) said to "Ali:

"You are to me as Haroon was to Moosa." It was said to Sufyan: “But there is no Prophet (ﷺ) after me." [Sufyan] said: Yes.

References1 variant
Arabic/English book
Book 8, Hadith 1547