'Ministered' in the Bible

On the seventh day, when the heart of the king was merry with wine, he commanded Mehuman, Biztha, Harbona, Bigtha, and Abagtha, Zethar, and Carcas, the seven chamberlains that ministered in the presence of Ahasuerus the king,

Then said the king's servants that ministered unto him, Let there be fair young virgins sought for the king:

And the king said, What honour and dignity hath been done to Mordecai for this? Then said the king's servants that ministered unto him, There is nothing done for him.