Narrated by Um Mubashir: Allah’s Apostle proposed to the widow of Al Baraa bin Ma’rour but she told him: “I promised my (dead) husband not to marry after him.” “This promise is not valid,” said the Prophet.
One cannot do such promises to one’s husband? what about promising that if u divorce me I won’t marry anyone again?
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This is not all valid.
If he dies or he divorces her, she can marry.