Exodus 34:10

34:10 He said, “See, I am going to make a covenant before all your people. I will do wonders such as have not been done in all the earth, nor in any nation. All the people among whom you live will see the work of the Lord, for it is a fearful thing that I am doing with you.

Exodus 34:27-28

34:27 The Lord said to Moses, “Write down these words, for in accordance with these words I have made a covenant with you and with Israel.” 34:28 So he was there with the Lord forty days and forty nights; he did not eat bread, and he did not drink water. He wrote on the tablets the words of the covenant, the ten commandments.