שופטים, פרק ח׳, פסוק ל׳

Gideon establishes a remarkably large family, ultimately becoming the father of seventy sons. Building such an extensive household naturally required him to marry many women.

While the Torah strictly limits the number of wives a king is permitted to take, this specific restriction did not apply in this situation. Because Gideon was never a king, he was exempt from the royal rule, leaving him free to marry as many women as he chose.