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If you told the purchaser that you would not be responsible for any defects that were discovered after one week, and that you would not agree to take back the item after that period, then you are not required to do anything after that period, provided that when you sold the item you were not aware of any defect in it. This comes under the heading of selling with the stipulation that the seller is not liable for any defects, which is a valid stipulation provided that the seller is unaware of the defect.

If a man says to his wife “I will divorce you” it is a promise (or a threat) of divorce, and divorce does not take place if he only says this phrase. What is most likely is that divorce does not take place immediately, even if the husband claims that he intended by using this phrase to initiate divorce with immediate effect, because the future participle sa- (equivalent to “will” in English) refers to the future, and the intention has an impact on identifying one of the meanings that the ambiguous word or phrase could refer to, but the intention cannot change the meaning of a phrase to a meaning that cannot be indicated by it, unless it is proven that the phrase could mean immediate divorce according to the custom and usage of language among a given community. In that case, the matter should be referred to a mufti issue a fatwa on a particular incident.

It is not permissible for your sister to take the gold in return for giving money to the other heirs that is to be paid later on; rather the money must be paid immediately after reaching the agreement.