Deuteronomy 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 11:29-30

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.

Joshua 8:30-33

Then Joshua built an altar for the Lord God of Israel on Mount Ebal,

Treasury of Scripture Knowledge

Summary

Therefore it shall be when ye be gone over Jordan, that ye shall set up these stones, which I command you this day, in mount Ebal, and thou shalt plaister them with plaister.

Bible References

In mount ebal

Deuteronomy 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.
Joshua 8:30
Then Joshua built an altar for the Lord God of Israel on Mount Ebal,

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