'My People' in the Bible

And a number of nations will be joined to the Lord in that day, and will become my people; and I will be living among you, and you will see that the Lord of armies has sent me to you.

This is what the Lord of armies has said: See, I will be the saviour of my people from the east country, and from the west country;

And I will make the third part go through the fire, cleaning them as silver is made clean, and testing them as gold is tested: and they will make their prayer to me and I will give them an answer: I will say, It is my people; and they will say, The Lord is my God.