It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to Sayyiduna Ali (may Allah be pleased with him): "You are to me in the position that Harun (peace be upon him) held with Musa (peace be upon him), except that there is no prophet after me."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2022