What is the ruling if the offer involves a marriage and the purchase of an object by the offeree?

Primary text

If the proposer states, 'I married you to my daughter, and I bought your slave from you for one thousand,' and the recipient responds, 'I sold it to you, and I accepted the marriage,' the transaction is valid. The sum of one thousand is apportioned between the price of the slave and the appropriate dowry (*Mahr al-Mithl*). This is permissible as it combines two intrinsically valid contractual elements.