She swore she would not forgive her husband, and after a period of time he died, then she forgave him. Is there anything required of her?
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Question : A discussion took place between me and so-and-so because of his failure to be just between his wives, and I said to him, "By Allah, I will never forgive you." He said, "Do not forgive me." Then the husband died, so I forgave him. Is there anything required of me regarding the oath?
Answer : Yes, she only has to pay the expiation for an oath, and she receives reward from Allah for having forgiven him.[Ash-Shuraa 42:40]
Answer : Yes, she only has to pay the expiation for an oath, and she receives reward from Allah for having forgiven him.
but whoever pardons and makes reconciliation - his reward is [due] from Allah
فَمَنْ عَفَا وَأَصْلَحَ فَأَجْرُهُ عَلَى اللَّهِ
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 110 - 332 حلفت ألا تسامح زوجها وبعد فترة مات ثم سامحته فهل عليها شيء؟ الفتاوى الثلاثية - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.