1 Corinthians 7:39

7:39 The wife is bound by the law as long as her husband liveth; but if her husband be dead, she is at liberty to be married to whom she will; only in the Lord.

Romans 7:2-3

7:2 For the woman which hath an husband is bound by the law to [her] husband so long as he liveth; but if the husband be dead, she is loosed from the law of [her] husband. 7:3 So then if, while [her] husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.