'Themselves' in the Bible

“Many nations will join themselves to the Lord on that day and become My people. I will dwell among you, and you will know that the Lord of Hosts has sent Me to you.

The angel told me, “These are the four spirits of heaven going out after presenting themselves to the Lord of the whole earth.

On that day I will make Jerusalem a heavy stone for all the peoples; all who try to lift it will injure themselves severely when all the nations of the earth gather against her.

The land will mourn, every family by itself: the family of David’s house by itself and their women by themselves; the family of Nathan’s house by itself and their women by themselves;

the family of Levi’s house by itself and their women by themselves; the family of Shimei by itself and their women by themselves;

all the remaining families, every family by itself, and their women by themselves.