Companions of the Prophet
حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ سَعْدٍ، قَالَ سَمِعْتُ إِبْرَاهِيمَ بْنَ سَعْدٍ، عَنْ أَبِيهِ، قَالَ النَّبِيُّ صلى الله عليه وسلم لِعَلِيٍّ " أَمَا تَرْضَى أَنْ تَكُونَ مِنِّي بِمَنْزِلَةِ هَارُونَ مِنْ مُوسَى ".And narrated Sad that the Prophet (ﷺ) said to 'Ali, "Will you not be pleased from this that you are to me like Aaron was to Moses?
From Sahih al-Bukhari, whose reports the scholars accept as authentic.