The Prophet Muhammad advised his followers to move in the land of Habbesha when they were rejected by Meccans. The Christan Kingdom of Ethiopia neither slaughtered them nor abandoned them. Rather they got shelter, food and protection  until peace came and they returned back home.

History has shown that the first migration to Ethiopia and the second migration to Madinah have indeed laid down the foundation on which Islam, as a universal religion, was built( http://www.selamta.net/ethiopian%20muslims%20history.htm)

How ISIL is saying that it killed (in Libya) the enemy from Ethiopian Church? http://www.aljazeera.com/news/middleeast/2015/04/isil-claims-massacre-ethiopian-christians-libya-150419104309814.html