Leviticus 18:16

18:16 You must not have sexual intercourse with your brother’s wife; she is your brother’s nakedness.

Matthew 14:3-4

14:3 For Herod had arrested John, bound him, and put him in prison on account of Herodias, his brother Philip’s wife, 14:4 because John had repeatedly told him, “It is not lawful for you to have her.”