The language is familiar: see verse 24. For Behold see 1.8.
Begin to: for Yahweh’s order, see Revised English Bible, “Begin the conquest, occupy the land.”
Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .