Tertullian

Let the one, therefore, have the necessity of continuing; the other, further, even the power of not marrying. Secondly, if, according to the Scripture, they who shall be "apprehended" by the faith in (the state of) Gentile marriage are not defiled (thereby) for this reason, that, together with themselves, others also are sanctified: without doubt, they who have been sanctified before marriage, if they commingle themselves with "strange flesh," cannot sanctify that (flesh) in (union with) which they were not "apprehended.

If these things may happen to those women also who, having attained the faith while in (the state of) Gentile matrimony, continue in that state, still they are excused, as having been "apprehended by God" in these very circumstances; and they are bidden to persevere in their married state, and are sanctified, and have hope of "making a gain" held out to them.