Ulangan 27:4

27:4 So when you cross the Jordan you must erect on Mount Ebal ¹  these stones about which I am commanding you today, and you must cover them with plaster.

Ulangan 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. ² 

[27:4]  ¹ tc Smr reads “Mount Gerizim” for the MT reading “Mount Ebal” to justify the location of the Samaritan temple there in the postexilic period. This reading is patently self-serving and does not reflect the original. In the NT when the Samaritan woman of Sychar referred to “this mountain” as the place of worship for her community she obviously had Gerizim in mind (cf. John 4:20).

[11:29]  ² sn Mount Gerizim…Mount Ebal. These two mountains are near the ancient site of Shechem and the modern city of Nablus. The valley between them is like a great amphitheater with the mountain slopes as seating sections. The place was sacred because it was there that Abraham pitched his camp and built his first altar after coming to Canaan (Gen 12:6). Jacob also settled at Shechem for a time and dug a well from which Jesus once requested a drink of water (Gen 33:18-20; John 4:5-7). When Joshua and the Israelites finally brought Canaan under control they assembled at Shechem as Moses commanded and undertook a ritual of covenant reaffirmation (Josh 8:30-35; 24:1, 25). Half the tribes stood on Mt. Gerizim and half on Mt. Ebal and in antiphonal chorus pledged their loyalty to the Lord before Joshua and the Levites who stood in the valley below (Josh 8:33; cf. Deut 27:11-13).