The total number of those who migrated this time was ten and...
The total number of those who migrated this time was ten and they included four Muslim women as well. It is worthy of note why the Holy Prophet did not mention other places. However, when the conditions then prevailing in Arabia and other places are studied the secret of the selection of Ethiopia becomes quite clear. The reason for this was that migration to places inhabited by the Arabs, who were usually idolaters, was dangerous.
The idolaters were reluctant to receive the Muslims, either because they wished to please Quraysh, or because they loved the religion of their forefathers. The places in Arabia inhabited by the Christians and the Jews were not at all fit for migration, because they were fighting and quarrelling with each other for their spiritual penetration, and there was no room for a third rival. Furthermore, these two groups considered people of the Arab descent to be inferior and humble.
Yemen was under the influence of the King of Iran and the Iranian authorities were not prepared to accommodate Muslims in that land, so much so that when Khusro Pervez received the letter from the Holy Prophet he at once wrote to the Governor of Yemen to arrest the new Prophet and send him to Iran. Hira, too, was under the domination of Iran like Yemen. Syria was far away from Makkah.
Furthermore, Yemen and Syria were the markets for Quraysh and they had close relations with the people of these areas. If the Muslims had taken shelter there those people would have expelled them on the request of Quraysh, who had made a similar request to the King of Ethiopia who turned it down. During those days journey by sea, particularly with women and children, was an extraordinarily difficult job.
Undertaking such a journey and abandoning means of livelihood was a sign of devotion and pure faith. Jeddah (and according to Jurji Zaydan the port of 'Shoaibiyah' of those days) was a developed trading port, and by chance two trading vessels were then ready to sail from there for Ethiopia. The Muslims, fearing pursuit by Quraysh, made known their intention to perform the journey and boarded the vessel in much haste, on payment of half a dinar.
A report regarding the departure of the Muslims had also reached the ears of the chiefs of Makkah and they sent some persons to bring them back, but by the time they reached there, the vessel had left the coast of Jeddah and could not be seen.