Albert Barnes Commentary Judges 1:7

"And Adoni-bezek said, Threescore and ten kings, having their thumbs and their great toes cut off, gathered [their food] under my table: as I have done, so God hath requited me. And they brought him to Jerusalem, and he died there." — Judges 1:7 (ASV)

Seventy kings - We may infer from this number of conquered kings that the internal wars of the Canaanites were among the causes which, under God’s Providence, weakened their resistance to the Israelites. Adoni-Bezek’s cruelty to the subject kings was the cause of his receiving this chastisement (compare to the marginal references). The loss of the thumb would make a man unfit to handle a sword or a bow; the loss of his big toe would impede his speed.