'Chosen One' in the Bible

I have solemnised a covenant, for my chosen one, I have sworn unto David my servant:

O ye Seed of Abraham - his servants, Sons of Jacob - his chosen ones:

Thus brought he forth his people with gladness, - With shouts of triumph, his chosen ones;

That I may look upon the welfare of thy chosen ones, That I may rejoice in the joy of thy nation, That I may glory, with thine inheritance.