Judges 13:1
The Birth of Samson
1 And the people of Israel yagain did what was evil in the sight of the Lord, so the Lord gave them into the hand of the zPhilistines for forty years.
Judges 15:20
20 fAnd he judged Israel in the days of the Philistines twenty years.
Judges 16:31
31 Then his brothers and all his family came down and took him and brought him up and buried him between Zorah and Eshtaol in the tomb of Manoah his father. qHe had judged Israel twenty years.