The tribe of Quraish was taken into consideration as one of the most respectable and honorable one amid the honorable Arab tribes of Hijaz (The land which is now known as Saudi Arabia was known as Hijaz before the Saudi dynasty came into existence).
The great grand father of the Prophet (P.B.U.H.) known as Kisa Bin Kalab was custodian of the Kaabah (The Haram of God). Quraish were divided into many different groups and Bani Hashim was the noblest one out of them.
Hashim was considered to be a noble, wise and honorable one among the people of Mecca. He helped and assisted the residents of Mecca and started the trading business in the summer and winter for the betterment of their lives. Therefore, the people gave him the title of Syed. This is the very reason why those who are his successors and out of his and Prophet's race are known as Syeds. The sons of Hashim following him known as Mutalib and Abdul Mutalib became the guardians and custodians of Quraish. Abdul Mutalib was a great personality. This was during his age that Abraha attacked Kaabah, but the Almighty God destroyed him. This added to the greatness of Abdul Mutalib. He loved Abdullah very much. Abdullah was married to the noble girl Amina at the age of twenty-four years.
Two months after the event of Amul-feel Amina bore a child who was named Mohammad (P.B.U.H.). Before the Birth of the Prophet (P.B.U.H.) his father Abdullah had passed away and after a short period his mother too breathed her last. The Prophet's (P.B.U.H.) grandfather Abdul Mutalib took over as his guardian. The son of Abdullah, the Prophet (P.B.U.H.) with the grace and mercy of God grew up to be such a young man with spiritual purity that the people of Mecca loved him and used to keep their belongings in his custody. This is the reason he was called "Amin."
The Prophet (P.B.U.H.), with his force of faith, backed and assisted the poor and oppressed ones, took his meals along with them, lent ear to their words and solved their problems.
The Prophet (P.B.U.H.), when some of the young ones organized an association known as the "Commitment of youths", joined them and started backing them because their aim was supporting the tyrannized ones and waging jihad (holy war) against the tyrants and cruel ones.
The Prophet (P.B.U.H.), as his uncle Abu Talib (R.A.) advised him, joined the trade caravan of Khatija (R.A.) and due to his correct and right work became the leader of the caravan.
After some time Khatija (R.A.) got impressed by his virtues and wished his hand in marriage. He accepted the proposal and the richest lady of Quraish put all her wealth into his feet (This wealth which was the greatest possible treasure of the Arab world of those days, was later on used by him for the sake of helping poor Muslims and spreading Islam) and at his disposal.