Rashi on Numbers 22:24/רש"י על במדבר כ״ב:כ״ד

1במשעול — Understand this as the Targum does: IN A PATH. And similar is, (1 Kings 20:10) “If the dust of Samaria shall suffice לשעלים” — the dust that attaches itself to the soles of peoples’ feet when they walk. And similarly, (Isaiah 40:12) “Who hath measured the water בשעלו” — with his feet and through his walking (as one measures by pacing).

2גדר מזה וגדר מזה A FENCE BEING ON THIS SIDE AND A FENCE ON THAT SIDE — The term גדר without further definition is one of stone (and that is why in the next verse it is called a קיר which is a term for a stone wall; cf. Leviticus 14:37—40).