'Master' in the Bible

Truly, I tell all of you emphatically, a servant isn't greater than his master, and a messenger isn't greater than the one who sent him.

I don't call you servants anymore, because a servant doesn't know what his master is doing. But I've called you friends, because I've made known to you everything that I've heard from my Father.

Remember what I told you: "A servant 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.