ভূমিকা
Shiavault - a Vault of Shia Islamic Books Khadija-tul-kubra the Wife of the Holy Prophet Chapter 8 : the Two Migrations of the Muslims To Abyssinia (615 - 616) Muhammed Mustafa, the Messenger of Allah, shared all the sorrows and afflictions of his followers who were being tortured for believing in Tauheed but he had no means to protect them.
When it appeared that there was going to be no deescalation in the violence against and persecution of the Muslims by the pagans, he suggested to them to leave Makka, and to seek sanctuary in Abyssinia which was then ruled by a Christian king, well-known for being a just and a God-fearing man. Following this suggestion, a group of Muslims, comprising eleven men and four women, left Makka and went to Abyssinia.
The group included Uthman bin Affan, a future khalifa of the Muslims, and Zubayr bin al-Awwam, a cousin of the Prophet. The Prophet appointed one of his principal companions, Uthman bin Mazoon, as the leader of this group.
Muhammad ibn Ishaq When the Apostle saw the afflictions of his companions and that though he escaped them because of his standing with Allah and his uncle, Abu Talib, he could not protect them, he said to them: "If you were to go to Abyssinia (it would be better for you), for the king (there) will not tolerate injustice and it is a friendly country, until such time as Allah shall relieve you from distress." Thereupon his companions went to Abyssinia, being afraid of apostasy and fleeing to God with their religion.
This was the first hijra in Islam. (The Life of the Messenger of God) The first migration took place in the fifth year of the Call (Proclamation), i.e., in AD. 615. The king of Abyssinia welcomed the Muslim refugees from Makka into his kingdom. He gave them sanctuary, and they found peace and security, and they enjoyed freedom of worship. It is reported that about a year later, the Muslim refugees in Abyssinia heard rumors that the Quraysh in Makka had accepted Islam.
If it was so, then there was no reason for them to live in exile, and they were very homesick. They, therefore, returned to Makka. But in Makka they found out that not only the reports of the conversion of the Quraysh to Islam were false but also that the latter had stepped up the persecution of the Muslims. They, therefore, left Makka once again but not alone. Many other Muslims accompanied them to Abyssinia.