Beat out — It is a metaphor from grain which was beaten out with a rod or staff, and then carefully gathered and laid up. From — From Euphrates to the Nile, which were the two borders of the land of promise. All the Israelites who are left in the land. One by one — Which signifies, God's exact care of them.
Related Commentaries of Isaiah 27:12
Isaiah 27:12
12 And it shall come to pass in that day, that the LORD shall beat off from the channel of the river unto the stream of Egypt, and ye shall be gathered one by one, O ye children of Israel.