Bible Verses About Widow: Marriage of, authorized

Therefore, while the husband is alive, she will be called an adulteress if she marries another man; but if the husband dies, she is free from that part of the Torah; so that if she marries another man, she is not an adulteress.

A wife is bound to her husband as long as he lives, but if the husband dies she is free to marry anyone she wishes, provided he is a believer in the Lord.