1 Corinthians
King James Version (KJV)

“But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace.”
King James Version (KJV)
7:15 A brother or a sister - A Christian man or woman. Is not enslaved - is at full liberty. In such cases: but God hath called us to peace - To live peaceably with them, if it be possible.
1Co 7:15 But if the unbelieving depart, let him depart. If the unbelieving husband or wife insists upon making the Christian profession a ground of separation, let them have their way. Examples of this kind occur in every age, and the rule is always applicable. God hath called us to peace. Hence, if strife must prevail to prevent separation, let the other go.