'Minister' in the Bible

Also the foreigners that join themselves to Jehovah, to minister unto him, and to love the name of Jehovah, to be his servants, every one that keepeth the sabbath from profaning it, and holdeth fast my covenant;

All the flocks of Kedar shall be gathered together unto thee, the rams of Nebaioth shall minister unto thee; they shall come up with acceptance on mine altar; and I will glorify the house of my glory.

And foreigners shall build up thy walls, and their kings shall minister unto thee: for in my wrath I smote thee, but in my favor have I had mercy on thee.