Adam Clarke on Joshua 18:26

And Mizpeh - This place is celebrated in the sacred writings. Here the people were accustomed to assemble often in the presence of the Lord, as in the deliberation concerning the punishment to be inflicted on the men of Gibeah, for the abuse of the Levite's wife. Jdg 20:1-3. Samuel assembled the people here to exhort them to renounce their idolatry, 1Sam 7:5, 1Sam 7:6. In this same place Saul was chosen to be king, 1Sam 10:17. It was deemed a sacred place among the Israelites; for we find, from 1 Maccabees 3:46, that the Jews assembled here to seek God, when their enemies were in possession of the temple.