People's Dictionary of the Bible
Land-mark. The removing of a landmark was specially prohibited by the Mosaic law. Deuteronomy 19:14; Deuteronomy 27:17; Proverbs 22:28; Proverbs 23:10. See also Job 24:2. As this was so flagrant an offence, the expression seems to have become proverbial to designate unprincipled conduct. See Hosea 5:10.
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Rice, Edwin Wilbur, DD. Entry for 'Land-Mark'. People's Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/rpd/l/land-mark.html. 1893.