Deuteronomy 27:4

27:4 So when you cross the Jordan you must erect on Mount Ebal these stones about which I am commanding you today, and you must cover them with plaster.

Deuteronomy 11:29

11:29 When the Lord your God brings you into the land you are to possess, you must pronounce the blessing on Mount Gerizim and the curse on Mount Ebal.