Mark 6:17-20
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
6:20 because Herod stood in awe of John and protected him, since he knew that John was a righteous and holy man. When Herod heard him, he was thoroughly baffled, and yet he liked to listen to John.