In 1 Corinthians 6:15-17, believers' union with Christ makes them holy, so they must not unite with a prostitute—here, that holiness sanctifies the marriage to an unbeliever.

Malachi 2:15 says God seeks godly offspring—parallel to Paul's statement that children of a believer are holy, both affirming the sanctity of children in marriage.

Romans 11:16 uses the same 'holy lump/root' logic — the part sanctifies the whole, directly mirroring the family holiness principle here.

Acts 16:1 describes Timothy, child of a believing mother and Greek father, exemplifying the holy children from a mixed marriage.

Leviticus 21:15 warns priests not to profane their offspring — similar principle that a parent's status affects children's holiness.

Acts 2:39 promises the Holy Spirit to believers' children, paralleling the inclusion of children in the sanctifying effect of a believing spouse.