Why does the Torah repeat Moshe's response, which it already recorded earlier (in 6:12)?
Rashi and Rashbam: This Pasuk too, is synonymous with Moshe's response in 6:12. 1
Ramban 2 : Moshe actually repeated his complaint that he was unworthy to be the Shali'ach to speak to Pharaoh.
Refer to 6:29:1:1 and its note.
Refer to 6:29:1:2.