What is the ruling on someone who declared a sum of money and some gold as mahr in the marriage contract before witnesses, with a prior agreement between him and his fiancée not to pay anything, and that only so as not to embarrass the woman?

This understanding between the man and his fiancée before the marriage contract is not considered valid, and he is obligated to pay the dowry stipulated in the contract, which is the property of the wife. If she is an adult and of sound mind and relinquishes it after the contract, then he is absolved.