Perhaps it's a covenant with someone under God's covenant with at least one of the parties is what changes it from man to God.
That would go along with what Paul said in consideration of a Christian married to a pagan.
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 Corinthians 7
This verse does not mean that the Christian spouse effects eternal life (salvation) for the pagan spouse. Because Paul points to the children, he means that the union is sanctified by the faith of the Christian spouse, so that the children are not automatically condemned.
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