Is the husband obligated to pay his wife the mahr al-mithl (dower of the like) after divorce, given that the agreed-upon dower (5 kg of gold) was exorbitant and not intended to be paid due to ignorance of its necessity, and that its due date was divorce or death?

If a man specifies the dowry correctly in the marriage contract (five kilograms of gold), he is not entitled to revert to a dowry of similar value (mahr al-mithl); because reversion only occurs when the dowry specification is invalid or the marriage contract itself is invalid. Consequently, he is obligated to pay this full dowry if he has consummated the marriage with his wife, or half of it if he divorces her before consummation and valid seclusion, unless the wife agrees to a dowry of similar value or less.