'Master' in the Bible

A master priest doth not defile himself among his people -- to pollute himself;

Do not be a hard master to him, but have the fear of God before you.

And if there is only a short time, he will take account of it with his master, and in relation to the number of years he will give back the price of making him free.

As a hired servant shall he be with him year by year; his master shall not rule with rigour over him before thine eyes.