What is the ruling of Islamic law concerning a married woman who committed adultery and repented with sincere repentance, but her husband exposed her and forced her to relinquish custody of her children and sign promissory notes, and he threatens to expose her further if she demands the return of her children?

Adultery is a reprehensible crime, and its punishment for a married person is stoning. If the adulteress repents, Allah accepts her repentance and replaces her evil deeds with good ones. She should increase her acts of obedience and avoid causes of temptation. The mother has the primary right to custody of her children before the age of seven, provided she is not a disbeliever or a transgressor. If the mother repents and becomes righteous, she has the right to custody because she is more compassionate and capable of caring for her children. Anyone who fails to fulfill their duty in their guardianship has no guardianship; rather, their hand is removed, or someone who fulfills the duty is joined with them. Custody is not an inheritance; rather, it is a guardianship that requires the ability to fulfill the duty. The mother should intercede through someone who can convince their father that her custody of the children is better for them. She should also frequently supplicate to Allah to ease her affairs and reunite her with her children.