He went to his father's house in Ophrah, and on one stone murdered his seventy brothers, the sons of Jerubbaal. But Jotham, the youngest son of Jerubbaal, survived, because he hid himself.

Judges 8:30
Gideon had seventy sons of his own, since he had many wives.

Judges 9:2
"Please ask all the leaders of Shechem, 'Is it better for you that seventy men, all the sons of Jerubbaal, rule over you, or just one man?' Remember that I am your own flesh and blood."

Judges 9:6
Then all the leaders of Shechem and Beth-millo gathered beside the oak at the pillar in Shechem and proceeded to make Abimelech their king.

Judges 9:18
but you have risen up against my father's house this day and killed his seventy sons on a single stone, and you have made Abimelech, the son of his maidservant, king over the leaders of Shechem because he is your brother--

2 Kings 10:7
And when the letter arrived, they took the sons of the king and slaughtered all seventy of them. They put their heads in baskets and sent them to Jehu at Jezreel.

2 Kings 11:1
When Athaliah the mother of Ahaziah saw that her son was dead, she proceeded to annihilate all the royal heirs.

2 Kings 11:2
But Jehosheba daughter of King Joram, the sister of Ahaziah, took Joash son of Ahaziah and stole him away from among the sons of the king who were being murdered. She put him and his nurse in a bedroom to hide him from Athaliah, and he was not killed.

2 Chronicles 21:4
When Jehoram had established himself over his father's kingdom, he strengthened himself by putting to the sword all his brothers along with some of the princes of Israel.

And he went to his father's house at Ophrah, and slew his brothers the sons of Jerubbaal, being three score and ten persons, on one stone: notwithstanding yet Jotham the youngest son of Jerubbaal was left; for he hid himself.