'Serveth' in the Bible

For which is greater, he that sitteth at meat, or he that serveth? is not he that sitteth at meat? but I am in the midst of you as he that serveth.

For he that herein serveth Christ is well-pleasing to God, and approved of men.

What soldier ever serveth at his own charges? who planteth a vineyard, and eateth not the fruit thereof? Or who feedeth a flock, and eateth not of the milk of the flock?

But ye know the proof of him, that, as a child'serveth a father,'so he served with me in furtherance of the gospel.