because Herod himself had sent men who arrested John, bound him with chains, and put him in prison on account of Herodias, his brother Philip's wife, whom Herod had married.

So Herodias bore a grudge against John and wanted to kill him. But she couldn't do it

When the daughter of Herodias came in and danced, she pleased Herod and his guests. So the king told the girl, "Ask me for anything you want, and I'll give it to you."