Mus`ab ibn `Umair
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Mus‘ab ibn Umair (Arabic: مصعب بن عمير) also known as Mus‘ab al-Khayr ("the Good") was a sahabi (companion) of Muhammad. From the Banū ‘Abd al-Dār branch of the Quraysh, he embraced Islam in 614 CE and was the first ambassador of Islam. He was martyred in the Battle of Uhud in 625 CE.
Mus‘ab ibn Umair was born to the Banū ‘Abd al-Dār branch of the Quraysh tribe. Although his exact birth year is not known, it is believed that he was born sometime between 594 and 598 CE since he was very young when he embraced Islam in 614. Mus‘ab was the son of Umair ibn Hashim and Khunaas Bint Maalik, and his parents were wealthy. Even as a young man, he was permitted to attend meetings of the Quraysh elders.
Conversion to Islam
The first Muslims used to meet with Muhammad at the house of Al-Arqam known as the islamic learning center. Mus'ab went to this house to find out more about Islam. As a result of hearing the reciting of the Qur'an and the preaching of Muhammad, he was converted.
At first Mus'ab kept his faith a secret, for he was afraid of how his mother would react. But one day a Quraysh opponent of Muhammad, Uthman ibn Talhal, saw him entering Al Arqam's house and joining the Muslim prayers. The news spread and eventually reached his mother, who chained him in their house with the intention of making him recant. Mus'ab would not renounce his faith. Muhammad advised him to join the companions who were emigrating to Abyssinia so that he would not be harassed again.
First Ambassador of Islam
Mus‘ab ibn Umair was appointed the first ambassador of Islam and was sent to Yathrib (Medina) to prepare the city for the forthcoming Hijra. A man of Medina named Sa'd ibn Zurarah assisted him. After they had preached Islam, many residents of Medina were converted, including such leading men such as Sa'd ibn Muadh, Usayd ibn Khudayr and Sa'd ibn Ubadah. It was estimated that by the time Muhammad arrived in September 622, Medina had ten thousand Muslims. These Medinan converts were known as Ansars ("helpers").
Battle of Badr
He participated in the Battle of Badr. Muhammad's forces included Abu Bakr, Umar, Ali, Hamza, Mus`ab ibn `Umair, Az-Zubair bin Al-'Awwam, Ammar ibn Yasir, and Abu Dharr al-Ghifari. The Muslims also brought seventy camels and two horses, meaning that they either had to walk or fit three to four men per camel. However, many early Muslim sources indicate that no serious fighting was expected, and the future Caliph Uthman stayed behind to care for his sick wife Ruqayyah, the daughter of Muhammad. Salman the Persian also could not join the battle, as he was still not a free man.
Many of the Quraishi nobles, including Amr ibn Hishām, Walid ibn Utba, Shaiba, and Umayah ibn Khalaf, joined the Meccan army. Their reasons varied: some were out to protect their financial interests in the caravan; others wanted to avenge Ibn al-Hadrami, the guard killed at Nakhlah; finally, a few must have wanted to take part in what was expected to be an easy victory against the Muslims. Amr ibn Hishām is described as shaming at least one noble, Umayah ibn Khalaf, into joining the expedition. 
Death in the Battle of Uhud
In the Battle of Uhud in 625 CE, Muhammad assigned Mus'ab ibn Umayr to carry the Muslim standard. During the battle, some Muslims fled from their positions on the battlefield, giving the opposing forces a clear path to attack Muhammad himself. On realising the danger, Mus'ab, who was of a similar build and colouring to Muhammad, raised the standard and shouted the takbir ("Allah is greatest!"), with the intention of diverting the enemies' attention towards himself and allowing Muhammad to escape unhurt. Mus'ab was attacked, and his right hand was severed, but he continued to repeat the Quranic words, "Muhammad is only a Messenger of God. Messengers have passed away before him." Eventually Musab was hit by a spear thrown by Ibn Kami'ah and was martyred.
We migrated in the company of Allah's Apostle, seeking Allah's Pleasure. So our reward became due and sure with Allah. Some of us have been dead without enjoying anything of their rewards (here), and one of them was Mus'ab bin 'Umar who was martyred on the day of the battle of Uhud, and did not leave anything except a Namira (i.e. a sheet in which he was shrouded). If we covered his head with it, his feet became naked, and if we covered his feet with it, his head became naked. So the Prophet said to us, "Cover his head with it and put some Idhkhir (i.e. a kind of grass) over his feet or throw Idhkhir over his feet." But some amongst us have got the fruits of their labor ripened, and they are collecting them.
Muhammad stood beside Musab's body and recited: "Among the believers are men who have been true to what they have pledged to God. The Messenger of God testifies that you are martyrs in the sight of God." When Mus'ab's wife, Hammanah bint Jahsh, heard about the death of her brother and maternal uncle, she replied, "To Allah we belong and to him we will verily return. I ask Allah‘s forgiveness for him." But when she heard about the death of her husband Mus'ab, she shouted and cried.
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