Exodus 3:12

3:12 He replied, “Surely I will be with you, and this will be the sign to you that I have sent you: When you bring the people out of Egypt, you and they will serve God on this mountain.”

Exodus 18:18

18:18 You will surely wear out, both you and these people who are with you, for this is too heavy a burden for you; you are not able to do it by yourself.