'Chosen One' in the Bible

[God has said] “I have made a covenant with My chosen one;I have sworn to David My servant,

O you offspring of Abraham, His servant,O you sons of Jacob, His chosen ones!

He brought out His people with joy,And His chosen ones with a joyful shout,

That I may see the prosperity of Your chosen ones,That I may rejoice in the gladness of Your nation,That I may glory with Your inheritance.

Therefore He said He would destroy them,[And He would have done so] had not Moses, His chosen one, stepped into the gap before Him,To turn away His wrath from destroying them.