1 Corinthians 7:13-15

Amplified Bible

¹³And if any [believing] woman has an unbelieving husband, and he consents to live with her, she must not leave him. ¹⁴For the unbelieving husband is ^[a]sanctified [that is, he receives the blessings granted] through his [Christian] wife, and the unbelieving wife is sanctified through her believing husband. Otherwise your children would be [ceremonially] ^[b]unclean, but as it is they are holy. ¹⁵But if the unbelieving partner leaves, let him leave. In such cases the [remaining] brother or sister is not [spiritually or morally] bound. But God has called us to ^[c]peace.

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Footnotes

1 Corinthians 7:14 The unbeliever is not saved by marriage to a Christian. Each person, whether spouse or child, must make a personal decision to accept and follow Christ to receive salvation and God’s promises.
1 Corinthians 7:14 The word used here seems to be borrowed from the language of OT ritual. There were many things that could render a person ceremonially unclean. All these things would disqualify a person from participating in worship, and required cleansing rituals to correct.
1 Corinthians 7:15 Probably peace between the spouses, hopefully leading to restoration and salvation (v 16).