To have sexual relations with someone who is married to another person.
All Scripture References (4)
Matthew (2)
Matthew 5:32
But I tell you that anyone who divorces his wife, except for sexual immorality, brings adultery upon her. And he who marries a divorced woman commits adultery.
Matthew 19:9
Now I tell you that whoever divorces his wife, except for sexual immorality, and marries another woman commits adultery.”
Mark (2)
Mark 10:11
So He told them, “Whoever divorces his wife and marries another woman commits adultery against her.
Mark 10:12
And if a woman divorces her husband and marries another man, she commits adultery.”