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 31:6

31:6 Moreover, I have also given him Oholiab son of Ahisamach, of the tribe of Dan, and I have given ability to all the specially skilled, that they may make everything I have commanded you: