"I came to Al-Madinah, and I was performing Hajj, and while we were in our camping place unloading our mounts, someone came to us and said: 'The people have gathered in the Masjid.' I looked and found the people gathered, and in the midst of them was a group; there I saw 'Ali bin Abi Talib, Az-Zubair, Talhah and Sa'd bin Abi Waqqas, may Allah have mercy on them. When I got there, it was said that 'Uthman bin 'Affan had come. He came, wearing a yellowish cloak. I said to my companion: Stay where you are until I find out what is happening. 'Uthman said: Is 'Ali here? Is Az-Zubair here? Is Talhah here? Is Sa'd here? They said: Yes. He said: I adjure you by Allah, beside Whom there is none worthy of worship, are you aware that the Messenger of Allah said: Whoever buys the Mirbad of Banu so and so, Allah will forgive him, and I bought it, then I came to the Messenger of Allah and told him, and he said: Add it to our Masjid and the reward for it will be yours? They said: Yes. He said: I adjure you by Allah, beside Whom there is none worthy of worship, are you aware that the Messenger of Allah said: Whoever buys the well of Rumah, Allah will forgive him, so I came to the Messenger of Allah and said: I have bought the well of Rumah. He said: Give it to provide water for the Muslims, and the reward for it will be yours? They said: Yes. He said: 'I adjure you by Allah, beside Whom there is none worthy of worship, are you aware that the Messenger of Allah said: Whoever equips the army of Al-'Usrah (i.e. Tabuk), Allah will forgive him, so I equipped them until they were not lacking even a rope or a bridle?' They said: Yes. He said: O Allah, bear witness, O Allah, bear witness, O Allah, bear witness."
Sunan an-Nasa'i Book 29, Hadith 13
"Abdul-'Aziz bin 'Abdul-Malik bin Abu Mahdhurah narrated from 'Abdullah bin muhairiz who was an orphan under the care of Abu Mahdhurah bin mi'yar that when he was preparing him to travel to Sham, he said: 'O my uncle, I am going out to Sham, and I will be asked about how you started the Adhan.' So he informed me that. Abu Mahdhurah said: 'I went out with a group of people, and we were somewhere on the road, when the Mu'adh-dhin of the Messenger of Allah gave the call to prayer in the presence of the Messenger of Allah. We heard the voice of the Mu'adh-dhin, and we were shunning it (the Adhan), so we started yelling, imitating it and mocking it. The Messenger of Allah heard us, so he sent some people who brought us to sit in front of him. He said: 'Who is the one whose voice I heard so loud?' The people all pointed to me, and they were telling the truth. He sent them all away, but kept me there and said to me: 'Stand up and give the call to prayer.' I stood up and there was nothing more hateful to me than the Messenger of Allah and what he was telling me to do. I stood up in front of the Messenger of Allah and the Messenger of Allah himself taught me the call. He said: "Say: 'Allahu Akbar Allahu Akbar, Allahu Akbar Allahu Akbar; Ash-hadu an la ilaha illallah, Ash-hadu an la ilaha illallah; Ash-hadu anna Muhammadan Rasulullah, Ash-hadu anna Muhammadan Rasulullah (Allah is the Most great, Allah is the most Great, Allah is the most Great, Allah is the most Great; I bear witness that none has the right to be worshipped but Allah, I bear witness that none has the right to be worshipped but Allah; I bear witness that Muhammad is the Messenger of Allah, I bear witness that Muhammad is the Messenger of Allah).'" Then he said: "Raise your voice (and say). Ash-hadu an la ilaha illallah, Ash-hadu an la ilaha illallah; Ash-hadu anna Muhammadan Rasulullah, Ash-hadu anna Muhammadan Rasulullah; Hayya 'alal-salah, Hayya 'alal-salah; Hayya 'alal-falah, Hayya 'alal-falah; Allahu Akbar Allahu Akbar; La ilaha illallah (I bear witness that none has the right to be worshipped but Allah, I bear witness that none has the right to be worshipped but Allah; I bear witness that Muhammad is the Messenger of Allah, I bear witness that Muhammad is the Messenger of Allah; Come to the Prayer, Come to the Prayer; Come to the prosperity, Come to the prosperity; Allah is the Most great, Allah is the Most Great; None has the right to be worshipped but Allah).'" Then he called me when I had finished saying the Adhan, and gave me a small bag in which there was some silver. Then he put his hand on the forelock of Abu Mahdhurah, then passed it over his face, then over his chest, and over his heart, until the hand of the Messenger of Allah reached his navel. Then the Messenger of Allah said: 'May Allah bless you and send blessings upon you.' I said: 'O Messenger of Allah, do you command me to give the call to prayer in Makkah?' He said: 'Yes, I command you (to do so).' Then all the hatred I had felt towards the Messenger of Allah disappeared, and was replaced with love for the Messenger of Allah. I came to 'Attab bin Asid, the governor of the Messenger of Allah in Makkah, and gave the call to prayer with him by command of the Messenger of Allah." (Sahih)He ('Abdul-'Aziz) said: "Someone who met Abu Mahdhurah told me the same as 'Abdullah bin Muhairiz told me."
Sunan Ibn Majah Book 3, Hadith 3
Sa`d bin Mu`adh came to Mecca with the intention of performing `Umra, and stayed at the house of
Umaiya bin Khalaf Abi Safwan, for Umaiya himself used to stay at Sa`d's house when he passed by
Medina on his way to Sham. Umaiya said to Sa`d, "Will you wait till midday when the people are (at
their homes), then you may go and perform the Tawaf round the Ka`ba?" So, while Sa`d was going
around the Ka`ba, Abu Jahl came and asked, "Who is that who is performing Tawaf?" Sa`d replied, "I
am Sa`d." Abu Jahl said, "Are you circumambulating the Ka`ba safely although you have given refuge
to Muhammad and his companions?" Sa`d said, "Yes," and they started quarreling. Umaiya said to
Sa`d, "Don't shout at Abi-l-Hakam (i.e. Abu Jahl), for he is chief of the valley (of Mecca)." Sa`d then
said (to Abu Jahl). 'By Allah, if you prevent me from performing the Tawaf of the Ka`ba, I will spoil
your trade with Sham." Umaiya kept on saying to Sa`d, "Don't raise your voice." and kept on taking
hold of him. Sa`d became furious and said, (to Umaiya), "Be away from me, for I have heard
Muhammad saying that he will kill you." Umaiiya said, "Will he kill me?" Sa`d said, "Yes,." Umaiya
said, "By Allah! When Muhammad says a thing, he never tells a lie." Umaiya went to his wife and
said to her, "Do you know what my brother from Yathrib (i.e. Medina) has said to me?" She said,
"What has he said?" He said, "He claims that he has heard Muhammad claiming that he will kill me."
She said, By Allah! Muhammad never tells a lie." So when the infidels started to proceed for Badr
(Battle) and declared war (against the Muslims), his wife said to him, "Don't you remember what your
brother from Yathrib told you?" Umaiya decided not to go but Abu Jahl said to him, "You are from
the nobles of the valley (of Mecca), so you should accompany us for a day or two." He went with them
and thus Allah got him killed.
Sahih al-Bukhari Book 61, Hadith 136