I Corinthians 7

¹⁴ 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.¹

Clean marriage, not a perverted one that would require repentance and separation for fornication or adultery, and a believing parent brings blessings to the children. God will reward them in life and death.

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¹The Holy Bible: King James Version. (1995). (electronic ed. of the 1769 edition of the 1611 Authorized Version., 1 Co 7:14). Bellingham WA: Logos Research Systems, Inc.