'Master' in the Bible

I call you no longer bondmen, for the bondman does not know what his master is doing; but I have called you friends, for all things which I have heard of my Father I have made known to you.

Remember the word which I said unto you, The bondman is not greater than his master. If they have persecuted me, they will also persecute you; if they have kept my word, they will keep also yours.