'Master' in the Bible

Truly, truly I say to you, a slave is not greater than his master, nor a messenger greater than the one who sent him.

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

Remember the word that I said 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 keep yours also.