The people of Medina were literate and had already heard...
The people of Medina were literate and had already heard from their Jewish and Christian friends about the awaited Redeemer /Savior/Comforter. When news about the Holy Prophet’s unique Message reached them, they sought and met the Prophet (S) and were convinced that he was the awaited Redeemer. Not only did they accept Islam, but they also pledged their support to any Muslim who wished to migrate to Medina.
The Muslims from Mecca who migrated to Medina are called the Muhajireen and the Muslims of Medina who pledged their support to the migrants are called the Ansar . The Prophet (S) directed the suffering Muslims to migrate to Medina. Soon, only a few Muslims were left in Mecca. The infidels of Mecca soon realized that, not yielding to their pressures, the Prophet (S) was already in the process of establishing a center away from Mecca, conducive to the successful propagation of his Mission.