Joshua 19:40 - Ellicott's Commentary On The Whole Bible

The seventh lot... of the children of Dan. — Dan was the most numerous tribe, next to Judah, in each census taken during the exodus. (See Numbers 1:26) This tribe had also had a post of honour in being commander of the rear-guard during the march. A similar post is here assigned to Dan in Palestine, viz., next to Judah, on the side of the Philistine territory. The Philistines were the most powerful and warlike of the unconquered nations of Palestine. The wisdom of guarding Israel on their frontier by the two strongest of the tribes is manifest. It was Samson, a Danite, who began to deliver Israel from them, and David completed the work. Though there were Philistine wars in the time of the later kings, they never had dominion over Israel after David’s time.