He was a slave. When he heard about Islam, he converted. When his "Master" found out her took him out in the sun made him lie down and placed heavey rocks on his chest. He wouldn't take the rocks of his chest unless Bilal said he wasn't a muslim. Mashallah, Bilal (ra) kept his ground and even in great pain still declared he was a muslim. Then Abu-Bakr (ra) bought Bilal (ra) off his "Master" and freed him. The freeing of slaves is encouraged in Islam, as we all belong to Allah.
All the Prophets of Almighty Allah preached Islam. They include Hazrat Adam, Hazrat Noah, Hazrat Abraham, Hazrat Moses, Hazrat Jesus Christ and Hazrat Muhammad (May peace be upon them all).
All the Prophets preached Islam. Hazrat Adam (AS) was the first Prophet of Islam. The last Prophet of Islam was Hazrat Muhammad (SAW) who started preaching Islam in570 AD, in Kakka, Arabia.
Christianity was founded by Hazrat Jesus Christ (May peace be upon him). Islam is founded by the last prophet of Islam Hazrat Muhammad (SAW).
Hajj used to be performed even before the birth of the last prophet of Islam Hazrat Muhammad SAW). Life for the traders became more profitable after the advent of Islam.
Hazrat Muhammad Performed Hajj One Year Before His Death
Hazrat Muhammad (SAW)
The first Prophet Hazrat Adam AS, the next prophets and the last prophet Hazrat Muhammad (SAW) began Islam as a religion.
Ka'aba was re-built by Hazrat Abraham (AS) and Hazrat Ismaiel (AS). Hazrat Abraham (AS) was commanded by Almighty Allah to announce to the people of the world to come to Ka'aba to perform pilgrimage. Thus Ka'aba was used as a place of worship and Hajj even before the the Last Prophet Hazrat Muhammad (May peace be upon him) started preaching Islam.
IN ISLAM HAZRAT MOHAMMAD P.B.H was the last prophet of ALLAH
Hazrat Imam Ali
hazrat mohammad (P.B.H)
by our Prophet Hazrat Muhammad