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." (Using translation from Tirmidhī 3730)   

قَالَ رَسُولُ اللهِ ﷺ لِعَلِيٍّ «أَنْتَ مِنِّي بِمَنْزِلَةِ هَارُونَ مِنْ مُوسَى إِلَّا أَنَّهُ لَا نَبِيَّ بَعْدِي»