Charles Ellicott Commentary Judges 2:10

"And also all that generation were gathered unto their fathers: and there arose another generation after them, that knew not Jehovah, nor yet the work which he had wrought for Israel." — Judges 2:10 (ASV)

Gathered unto their fathers. — See 2 Kings 22:20, and for similar phrases, Genesis 15:15; 1 Kings 1:21; Acts 13:36, and others. Another common phrase is: “gathered unto his people” (Genesis 15:8, and others); and “sleep with fathers” (Deuteronomy 31:16, and others).

Which knew not the Lord. — They proceed from evil to evil, and they know not me, saith the Lord (Jeremiah 9:3).