The Messenger of Allah (s.a.w.a.) said to Ali b. Abi Talib:

Are you not pleased that you are to me as Harun was to Musa, except that there is no prophet after me? And if there were to be one, it would have been you.
Tarikh Dimishq v 1 p 346 Tarikh al-Baghdad v 3 p 288 Kanz al-Ummaal p 282 Ehqaq al-Haqq v 16 p 86 Maqtal al-Husain v 1 p 48 Ghaayah al-Maraam p 119 Behaar al-Anwaar v 37 p 255