Question
Where in the Torah does it describe Moshe putting a hot coal in his mouth so that he had a speech defect and where does it state that Aaron was sent with Moshe to Egypt to speak for the Jews?
Answer
The story involving the coals can be found in Midrash Shemos Rabbah 1:26. Aaron’s involvement as spokesman is found in the Torah in Shemos (Exodus) 4:14-16.