What you say goes is the tenth of thirty-eight cinematics shown in The Last of Us. It is approximately one minute and fifteen seconds long in length. Below is the complete transcription for this cutscene's spoken dialogue.
Note that the dialogue is copied from the subtitles.
Ellie: [Standing.] Hey, look, um... about Tess. I don't even know what to-
Joel: Here's how this thing's gonna play out. You don't bring up Tess - ever. Matter of fact, we can just keep our histories to ourselves. Secondly, don't tell anyone about your... condition. They'll either think your crazy or they'll try to kill you. And lastly, you do what I say, when I say it. We clear?
Joel: Repeat it.
Ellie: What you say, goes.
Joel: [Exhales.] Good. [Stands up.] Now, there's a town a few miles north of here. There's a fella that owes me some favors...good chance he could get us a car.
Joel: Let's get a move on.
[Joel walks off and Ellie follows. End cinematic.]