[A little brother]

I am not sure whether I went too far. Like in the Old Testament, Nebuchadnezzar is called the Lord's servant. But he is not one of God's chosen people. So does a servant imply believer even though the Lord uses him?

Another example is Matt 24:45-51, the punishment of the evil slave was:
And will cut him asunder and appoint his portion with the hypocrites. In that place there will be the weeping and the gnashing of teeth.

The hypocrites don't sound like believers to me and the evil slave was treated the same.

Also in Luke 12:46,
The master of that slave will come on a day when he does not expect him and at an hour which he does not know, and will cut him asunder, and will appoint his portion with the unbelievers.