Exodus 4:21

4:21 The Lord said to Moses, “When you go back to Egypt, see that you do before Pharaoh all the wonders I have put under your control. But I will harden his heart and he will not let the people go.

Exodus 33:16

33:16 For how will it be known then that I have found favor in your sight, I and your people? Is it not by your going with us, so that we will be distinguished, I and your people, from all the people who are on the face of the earth?”