Matthew 19:9
And I say to you: whoever divorces his wife, except for sexual immorality, and marries another, commits adultery. The dominical ruling on divorce: the only ground for divorce that does not produce the adultery of remarriage is sexual immorality (porneia). The except clause — the Matthean exception — limits but does not abolish Jesus' general prohibition on divorce-and-remarriage. The context is the one who divorces and marries another: the one who divorces on other grounds and remarries commits adultery.