Egypt and Assyria saved
Isa 19:23 In that day shall there be a highway out of Egypt to Assyria, and the Assyrian shall come into Egypt, and the Egyptian into Assyria, and the Egyptians shall serve with the Assyrians.
In that day, refers to the end times, perhaps after Christ Jesus returns. Two enemy nations will serve the Lord together in Jerusalem, in the millenium.
Isa 19:24 In that day shall Israel be the third with Egypt and with Assyria, even a blessing in the midst of the land:
Isa 19:25 Whom the LORD of hosts shall bless, saying, Blessed be Egypt my people, and Assyria the work of my hands, and Israel mine inheritance.
All the nations that remain will come to Jesus and be under his authority. There will at last be peace on earth among all peoples for a thousand years. Assyria is modern day Iraq. In the days of old it was a cruel country, torturing it's prisoners. Jonah hated them and would not go to them to prophesy, because he wanted them destroyed, not saved. Have we enemies that we do not want to be saved? Jesus came to save that which was lost, so we should follow his example.
Mat 5:43 Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy.
Mat 5:44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Mat 5:45 That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.