Idra Raba: Chapter 13
The third Correction (formation)

Rabbi Chiya opens by telling the difference between speaking and saying, and we hear that speaking calls for both a raising of the voice and a proclamation of words. He points out several places where 'speaking' is used, and says that Moses was not even fearful when Hashem spoke to him. Rabbi Chiya tells us that the first and second Corrections (formations) of the beard came to bring about the third one, the forgiveness of transgressions.