'Master' in the Bible

I tell you the solemn truth, the slave is not greater than his master, nor is the one who is sent as a messenger greater than the one who sent him.

I no longer call you slaves, because the slave does not understand what his master is doing. But I have called you friends, because I have revealed to you everything I heard from my Father.

Remember what I told you, 'A slave is not greater than his master.' If they persecuted me, they will also persecute you. If they obeyed my word, they will obey yours too.