For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy.
All Commentaries on 1 Corinthians 7:14 Go To 1 Corinthians 7
Irenaeus of Lyons
AD 202
And for this reason, Paul declares that the "unbelieving wife is sanctified by the believing husband."