Mark 6:17-19

6:17 For Herod himself had sent men, arrested John, and bound him in prison on account of Herodias, his brother Philip’s wife, because Herod had married her. 6:18 For John had repeatedly told Herod, “It is not lawful for you to have your brother’s wife.” 6:19 So Herodias nursed a grudge against him and wanted to kill him. But she could not

Mark 6:24-25

6:24 So she went out and said to her mother, “What should I ask for?” Her mother said, “The head of John the baptizer.” 6:25 Immediately she hurried back to the king and made her request: “I want the head of John the Baptist on a platter immediately.”