Deuteronomy 4:10,15
Specially the day that you stood before the LORD your God in Horeb, when the LORD said to me, Gather me the people together, and I will make them hear my words, that they may learn to fear me all the days that they shall live on the earth, and that they may teach their children.
Torrey's Topical Textbook—AKJV

Deuteronomy 5:2
The LORD our God made a covenant with us in Horeb.
Torrey's Topical Textbook—AKJV