Amir b. Sa'd b. Abi Waqqas reported on the authority of his father that Muawiya b. Abi Sufyan appointed Sa'd as the Governor and said:

What prevents you from abusing Abu Turab (Hadrat 'Ali), whereupon be said: It is because of three things which I remember Allah's Messenger (ﷺ) having said about him that I would not abuse 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 (ﷺ) 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 (ﷺ) 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 (ﷺ) called 'Ali, Fatima, Hasan and Husain and said: O Allah, they are my family.

"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 (ﷺ) say: "For whomever I am his mowla, `Ali is his mowla." 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."

"I was with Ibn Abbas in Arafat and he said: 'Why do I not hear the people reciting Talbiyah?' I said: They are afraid of Muawiyah.' So Ibn Abbas went out of his tent and said: "Labbaik Allahumma Labbaik, Labbaik! They are forsaking the Sunnah out of hatred for Ali.'"

A person from the offspring of Marwan (9th Khalifah) was appointed as the governor of Medina. He called Sahl b. Sa`d and ordered him to abuse `Ali. Sahl refused to do that.

He (the governor) said to him: If you do not agree to it (at least) say: May Allah curse Abu Turab. Sahl said: There was no name dearer to `Ali than Abu Turab (for it was given to him by the Prophet himself) and he felt delighted when he was called by this name. He (the governor) said to him: Narrate to us the story of his being named as Abu Turab. He said: Allah's Messenger (ﷺ) came to the house of Fatima and he did not find `Ali in the house; whereupon he said: Where is your uncle's son? She said: (There cropped up something) between me and him which had annoyed him with me. He went out and did not rest here. Allah's Messenger (ﷺ) asked a person to find out where he was. He came and said: Allah's Messenger, he is sleeping in the mosque. Allah's Messenger (ﷺ) came to him and found him lying in the mosque and saw that his mantle had slipped from his back and his back was covered with dust and Allah's Messenger (ﷺ) began to wipe it away from him (from the body of Hadrat `Ali) saying: Get up, covered with dust (Abu Turab); get up, covered with dust.

The Unlettered Prophet informed me (saying) that none but a believer would love me and none but a hypocrite would hate me