'Completing' in the Bible

Now let the king be aware that the Jews who came up to us from you have gone to Jerusalem. They are rebuilding that rebellious and odious city. They are completing its walls and repairing its foundations.

I glorified you on earth by completing the work you gave me to do.

But while John was completing his mission, he said repeatedly, 'What do you think I am? I am not he. But look, one is coming after me. I am not worthy to untie the sandals on his feet!'