Thou didst divide them into corners. i.e. "didst plant them in every corner of the Holy Land,"—"gave them to possess the whole of it,"—ultimately, that is, not at first (see the comment on Nehemiah 9:8).
The land of Sihon, and the land of the king of Heshbon. The Levites must have known that Sihon was king of Heshbon, and (if the text is sound) must have expressed themselves as they did, by way of rhetorical amplification; perhaps, however, the vav after "Sihon" is the mistake of a copyist.