Hebrews 13:4

13:4 Marriage must be honored among all and the marriage bed kept undefiled, for God will judge sexually immoral people and adulterers.

Revelation 2:19-23

2:19 ‘I know your deeds: your love, faith, service, and steadfast endurance. In fact, your more recent deeds are greater than your earlier ones. 2:20 But I have this against you: You tolerate that woman Jezebel, who calls herself a prophetess, and by her teaching deceives my servants to commit sexual immorality and to eat food sacrificed to idols. 2:21 I have given her time to repent, but she is not willing to repent of her sexual immorality. 2:22 Look! I am throwing her onto a bed of violent illness, and those who commit adultery with her into terrible suffering, unless they repent of her deeds. 2:23 Furthermore, I will strike her followers with a deadly disease, and then all the churches will know that I am the one who searches minds and hearts. I will repay each one of you what your deeds deserve.