It is narrated from Sayyiduna Malik bin al-Huwayrith (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to Ali (may Allah be pleased with him): "Are you not pleased to hold the same rank in relation to me as Harun (peace be upon him) held in relation to Musa (peace be upon him)?"
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16696