What is a remnant?
“It is a part or quantity that is left after the greater part has been used, removed, or destroyed”.
In Christian Theology
“Remnant is a small minority of people who will remain faithful to God and so be saved”.
“Isaiah cries out concerning Israel, “Though the number of the sons of Israel be like the sand of the sea, it is the remnant that will be saved” – Romans 9:27
Then it will happen on that day that the Lord will again recover the second time with His hand the remnant of His people, who will remain, from Assyria, Egypt, Pathros, Cush, Elam, Shinar, Hamath, and from the islands of the sea.
In that day the Lord will start His threshing from the flowing stream of the Euphrates to the brook of Egypt, and you will be gathered up one by one, O sons of Israel. It will come about also in that day that a great trumpet will be blown, and those who were perishing in the land of Assyria and who were scattered in the land of Egypt will come and worship the Lord in the holy mountain at Jerusalem.
The Context that is producing the remnant is the Apostolic Reformation.