en_tn/1co/07/15.md

In such cases, the brother or sister is not bound to their vows

Here "brother" and "sister" refers to a Christian husband or wife. Here "not bound to their vows" is a metaphor that mean the person is not obligated to do what they vowed to do. This can be stated in active form. Alternate translation: "In such cases, God does not require the believing spouse to continue to obey the marriage vow" (See: rc://en/ta/man/jit/figs-metaphor and rc://en/ta/man/jit/figs-activepassive)