Exodus 6:9-13

9Moses spoke this way to Bnei-Yisrael, but they did not listen to him because of their broken spirit and cruel bondage.

10So Adonai told Moses,

11“Go, speak to Pharaoh king of Egypt, so that will he let Bnei-Yisrael go out of his land.”

12But Moses said to Adonai, “Bnei-Yisrael have not listened to me. So how would Pharaoh listen to me—I, who have uncircumcised lips?”

13Then Adonai spoke to Moses and to Aaron and gave to them a charge for Bnei-Yisrael and Pharaoh king of Egypt, to bring Bnei-Yisrael out of the land of Egypt.