Mark 6:19, 24-26

So Herodias bore a grudge against John and wanted to kill him. But without Herod’s approval she was powerless

She went out and asked her mother, “What should I ask for?” Her mother told her, “Ask for the head of John the Baptist!” So the girl hurried back to the king and told him, “I want the head of John the Baptist, right now, on a tray!” Then the king deeply regretted what he had said; but because of the vows he had made in front of his guests, he couldn’t refuse her.