'Master' in the Bible

“I assure you: A slave is not greater than his master, and a messenger is not greater than the one who sent him.

I do not call you slaves anymore, because a slave doesn’t know what his master is doing. I have called you friends, because I have made known to you everything I have heard from My Father.

Remember the word I spoke to you: ‘A slave is not greater than his master.’ If they persecuted Me, they will also persecute you. If they kept My word, they will also keep yours.