Luke 3:18-20

18So with many other appeals and various admonitions John preached the good news (gospel) to the people.

19But when Herod [Antipas] the tetrarch was repeatedly reprimanded [and convicted by John’s disapproval] for having Herodias, his brother’s wife [as his own], and for all the wicked things that Herod had done,

20he also added this to them all: he locked up John in prison.