Sa`d b. Abu Waqqas told that God's messenger said to `Ali, "You are in the same position with relation to me as Aaron was with relation to Moses; but there will be no prophet after me." (Bukhari and Muslim.)

Aren't you satisfied with being unto me what Aaron was unto Moses?

The Prophet said to 'Ali: "Would it not please you to be to me as Harun was to Musa?"

Allah's Messenger, are you leaving me behind amongst women and children? Thereupon he (the Holy Prophet) said: Aren't you satisfied with being unto me what Aaron was unto Moses but with this exception that there would be no prophet after me?

that the Prophet (SAW) said to 'Ali: "You are to me in the position that Harun was to Musa, except that there is no Prophet after me."

You are in the same position with relation to me as Aaron (Harun) was in relation to Moses but with (this explicit difference) that there is no prophet after me. Sa'd said: I had an earnest desire to hear it directly from Sa'd, so I met him and narrated to him what (his son) Amir had narrated to me, whereupon he said: Yes, I did hear it. I said: Did you hear it yourself? Thereupon he placed his fingers upon his ears and said: Yes, and if not, let both my ears become deaf.

that the Prophet (SAW) said to 'Ali, "You are to me, in the position that Harun was to Musa, [except that there is no Prophet after me]."

"Mu`awiyah came on one of his pilgrimages and Sa`d entered upon him. They mentioned `Ali, and Mu`awiyah criticized him. Sa`d became angry and said: 'Are you saying this of a man of whom I heard the Messenger of Allah (saws) say: "If I am a person's close friend, `Ali is also his close friend." And I heard him say: "You are to me like Harun was to Musa, except that there will be no Prophet after me." And I heard him say: "I will give the banner today to a man who loves Allah and His Messenger."

What prevents you from rebuking Abu Turab (Hadrat 'Ali), whereupon be said: It is because of three things which I remember Allah's Messenger (may peace be upon him) having said about him that I would not rebuke him and even if I find one of those three things for me, it would be more dear to me than the red camels. I heard Allah's Messenger (may peace be upon him) say about 'Ali as he left him behind in one of his campaigns (that was Tabuk). 'Ali said to him: Allah's Messenger, you leave me behind along with women and children. Thereupon Allah's Messenger (may peace be upon him) said to him: Aren't you satisfied with being unto me what Aaron was unto Moses but with this exception that there is no prophethood after me. And I (also) heard him say on the Day of Khaibar: I would certainly give this standard to a person who loves Allah and his Messenger, and Allah and his Messenger love him too. He (the narrator) said: We had been anxiously waiting for it, when he (the Holy Prophet) said: Call 'Ali. He was called and his eyes were inflamed. He applied saliva to his eyes and handed over the standard to him, and Allah gave him victory. (The third occasion is this) when the (following) verse was revealed: "Let us summon our children and your children." Allah's Messenger (may peace be upon him) called 'Ali, Fatima, Hasan and Husain and said: O Allah, they are my family.