'Umar ibn 'Abdu'l-'Aziz asked Abu Bakr ibn Abi Hathama, "Why did Abu Bakr write, 'From Abu Bakr, the Khalifa (Successor) of the Messenger of Allah' and then 'Umar wrote after him, 'From 'Umar ibn al-Khattab, the khalifa (successor) of Abu Bakr'? Who was the first to write 'the Amir al-Mu'minin'?" He replied, "My grandmother, ash-Shifa', related to me, and she was one of the first to write 'the Amir al-Mu'minin'?" He said, "My grandfather, ash-Shifa' related to me, (and she was one of the first Muhajirun and when 'Umar ibn al-Khattab entered the market, he visited her), saying, ''Umar ibn al-Khattab wrote to the governor of Iraq requesting him to send him two trustworthy noble men so that he could question them about Iraq and its people. He sent him a master of Iraq, Labid ibn Rabi'a and also 'Adi ibn Hatim, and they came to Madina. They made their camels kneel in the courtyard of the mosque, entered it and found 'Amr ibn al-'As. They said to him, ''Amr, ask permission for us to visit the Amir al-Mu'minin, 'Umar.' 'Amr got up and went to 'Umar. He said, 'Peace be upon you, Amir al-Mu'minin.' 'Umar said to him, 'Ibn al-'As, what made you use this name? You have deviated from what you normally say.' He said, 'Yes, Labid ibn Rabi'a and 'Adi ibn Hatim came and said to me, "Ask permission for us to visit the Amir al-Mu'minin." I said, "You two, by Allah, have hit upon the correct name. He is the amir and we are the believers."' The title originated on that day."

'Ubaydullah ibn 'Abdullah said, "Mu'awiya went on his first hajj when he was the khalifa and 'Uthman ibn Hanif al-Ansari came to him and said, 'Peace be upon you, Amir, and the mercy of Allah.' The people of Syria objected to that and said, 'Who is this hypocrite who shortens the greeting of the Amir al-Mu'minin!' 'Uthman made his camel kneel and said, 'Amir al-Mu'minin! These men object to something which you know better than them. By Allah, I used to this greeting for Abu Bakr, 'Umar, and 'Uthman, and none of them objected to it.' Mu'awiya said to those of the people of Syria who had spoken, 'Take it easy! It was partly as he stated. But when the civil war engaged the people of Syria, they said, "Do not shorten the greeting of our khalifa in our presence (i.e. from Amir al-Mu'minin to Amir)." People of Madina, I will treat you as friends even though you use 'Amir" for a zakat collector.'"

Jabir said, "I visited al-Hajjaj and did not greet him."

Tamim ibn Hadhlam said, "I will mention the first to be greeted as 'Amir' in Kufa. Al-Mughira ibn Shu'ba left by the Bab ar-Rahba and a man of Kinda came up to him. They claim that it was Abu Qurra al-Kindi. He greeted him and said, 'Peace be upon you, O Amir, and the mercy of Allah.' He disliked it. So the man said, 'Peace be upon you, O Amir, and the mercy of Allah. Peace be upon you. Am I one of you or not?'" Sammak ibn Salama ad-Dabi said, "After that it became an established practice."

Ziyad ibn 'Ubayd (ar-Ru'ayni) said, "We went to Ruwayfa', the Amir of Antabulis. A man came and greeted him, saying, 'Peace be upon the Amir.' From 'Abda, he said, 'Peace be upon the Amir.' Ruwayfa' said to him, 'If you had greeted us, we would have returned the greeting. But you greeted Maslama ibn Mukhallad (Maslama was in charge of Egypt). Go to him and he will return your greeting.'"

Al-Miqdad ibn al-Aswad said, "The Prophet, may Allah bless him and grant him peace, used to come at night and would give the greeting in such a way that it would not awaken anyone asleep, but the person who was awake would hear it."

'Umar said to 'Adi ibn Hatim, "May Allah preserve you from recognition."

'A'isha said, "Fatima walked in the same manner that the Prophet, may Allah bless him and grant him peace, walked. He used to say to her, 'Welcome, my daughter!' Then he would have her sit down on his right or his left."

'Ali said, "'Ammar asked for permission to enter to visit the Prophet, may Allah bless him and grant him peace, and the Prophet recognised his voice and said, 'Welcome with the best and purest greeting!'"

'Uqba ibn 'Abdullah ibn 'Amr who said, "While we were sitting with the Prophet, may Allah bless him and grant him peace, in the shade of a tree while travelling between Makka and Madina, a bedouin, who was an example of the coarsest and fiercest kind of people came up and said, 'Peace be upon you,' and they said, 'And upon you.'"

Abu Jamra said, "I heard Ibn 'Abbas say when he was greeted, 'And upon you and the mercy of Allah.'"

Qayla reported that a mans aid, "Peace be upon you, may Allah bless him and grant him peace." He said, "And peace be upon you and the mercy of Allah."

Abu Dharr said, "I came to the Prophet, may Allah bless him and grant him peace, when he had finished his prayer. I was the first person to be greeted with the greeting of Islam. He said, 'And on you and the mercy of Allah. From where have you come?' I said, 'From Ghifar.'"

'A'isha reported, "The Messenger of Allah, may Allah bless him and grant him peace, said, ''A'ish! This is Jibril who sends you greetings.' I said, 'And peace be upon him and the mercy of Allah and His blessings. You see what I do not see." By that she meant the Messenger of Allah, may Allah bless him and grant him peace.

Mu'awiya ibn Qurra said that his father said to him, "My son, when a man passes by you and says, 'Peace be upon you (plural).' Do not say, 'And on you (singular)' as if you were singling out that greeting out for him alone. Rather say, 'Peace be upon you (plural).'"

'Abdullah ibn as-Samit said, "I said to Abu Dharr, 'I passed by 'Abdu'r-Rahman ibn Umm al-Hakam and I greeted him and he did not answer me at all. He said, 'Nephew, what harm have suffered from that? Someone better than him answered you ? the angel on his right."

'Abdullah said, "Peace is one of the Names of Allah which Allah has placed on the earth. Extend it among you. When a man greets people and they answer him, then he has a higher degree than them because he reminds them of peace. If no one answers him, he will be answered by one who is better and more excellent.'"

Al-Hasan said, "Greeting is an act of obedience while the answer is a duty."

'Abdullah ibn 'Amr ibn al-'As said, "A liar is someone who lies in his oath. A miser is someone who is miserly with the greeting. A thief is someone who steals the prayer."

Abu Hurayra said, "The most miserly of people is the one who is miserly with the greeting. The most incapable of people of people is the one who is the most incapable of supplication."