This verse is its own saying within the Sayings of the Wise; its close companion stands at 23:10–11.
Quick answer
Do not move the old boundary stone. In a world where a stone in a field was the land deed, relocating it was theft in slow motion, usually from a neighbor too weak to stop it.
Read both lines
The ancient landmark, the footnote reads "boundary," marked where one family's inheritance ended and another's began; set generations back, "which your fathers have set," it protected the allotments the LORD Himself had distributed (Deuteronomy 19:14). Moving it a few furrows a season was the quiet man's way to steal a field without ever looking like a thief. The saying's companion at 23:10–11 shows who the crime usually targeted, the fatherless, and who takes the case: their mighty Redeemer. The principle under the stone outlives the geography: boundaries that protect the weak, in land, law, or trust, are not obstacles to prosperity but the inheritance of people who cannot defend them, and the LORD watches what happens to them.
Related: Proverbs 23:10–11 · Deuteronomy 19:14 · Job 24:2
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.