1CO 7:14

14 [I say that] because God has set apart every woman’s unbelieving husband [for himself] because of his wife [being a believer], and God has set apart every man’s unbelieving wife [for himself] because of her husband [being a believer]. If that were not true, [God would consider] their children unacceptable. But, the fact is that [God does consider] them acceptable to him.