its already an established fact in the Bible and its also binding on both parties as long as they both shall live,
I never really understand this till now whenever I see couples exchange vows before the priest on their wedding day, to take one as husband or wife to hold to love and care till death do them part, that means its untill death that they are free from the hold of that covenant.
For the woman who has a husband is bound by the law to her husband as long as he lives. But if the husband dies, she is released from the law of her husband, So then if, while her husband lives, she marries another man, she will be called an adulteress; but if her husband dies, she is free from that law, so that she is no adulteress, though she has married another man, Romans 7:2-3
it's normal and it's totally acceptable that a man or woman remarries after the death of either of the parties, however in some cultures and traditions especially in Africa some women are forbidden to remarry or in some cases the husband's brother or some one in the family has to take on and marry the woman to continue the legacy of their brother.....
it's a very expository teachings on finding comfort, confidant, trust, someone to share some moment with especially when one is overwhelmed..... just paraphrasing as the Bible puts it if one is alone he is easily defeated but two can warm each other if one falls the other can help him up, a three fold cord is nit easily broken....
this is an insightful teaching not to dispise those who have lost a partner and have to remarry