As the answer to this question explains, during Rey's "dream"1 in The Force Awakens, we hear Obi-Wan's voice saying:
Rey... these are your first steps.
The word "Rey" is a sample edited from Alec Guinness saying "afraid" in one of the OT films; the rest of the line was a recording of Ewan McGregor made specifically for The Force Awakens. I actually noticed the line when I saw the movie, and I immediately recognized the voice behind the "Rey" portion as that of Alec Guinness.
However, the scene in question is very jarring, fast-paced, disorienting, and confusing, so I had trouble taking in everything that was happening. In all the commotion and rapid-fire changes of scenery and action, I apparently missed another familiar voice.
According to this article, the dream sequence also features a brief vocal performance from Frank Oz as Yoda, but I totally missed it, and now I'm dying to know exactly what Yoda said.
What does Yoda say during Rey's dream?
Note: My question is related to this one about what Rey sees in her dream, but whereas that question focuses on the visuals, mine is directed at what she hears Yoda say.
1 I don't think "dream" is really an accurate description of what is happening, but I don't know what else to call it - "dream", "flashback", "vision", and "hallucination" each convey a bit of what is happening to Rey, but none of these words seem to describe the entirety of the experience in a satisfactory way; I have opted to use the word "dream" because it is as good as any of the other options, but I think it covers slightly more territory than any of the others do.