||On the day that you cross the Jordan to the land that God your Lord is giving you, you must erect large stones and plaster them with lime.
Vehayah bayom asher ta'avru et-haYarden el-ha'arets asher-Adonay Eloheycha noten lach vahakemota lecha avanim gedolot vesadeta otam basid.
|On the day|
Some sources indicate that this was not done until after the blessings (Sotah 32a). Other sources indicate that it was before the blessings (cf. Lekach Tov). See Joshua 8:33.
Twelve stones; Joshua 4:3. They were like the 12 pillars erected by Moses (Exodus 24:4), and served as a sort of mezuzah for the Holy Land (Abarbanel).
To give them a surface for writing. However, in the Talmud there is an opinion that the lime was placed over the writing to preserve it (Sotah 35b). Others maintain that these stones were made into an altar, and the plaster was to hold them together (Chizzkuni). Others say that they were set in lime so as to keep them standing (Ibn Ezra).