The Ruling on Conditions in Delegation for Slaughtering

Question
What is the ruling for someone who sold a sacrificial animal on the condition that its weight after slaughtering and cutting is a specific amount, for example, 25 kilograms, and if it does not weigh this amount, he will not pay its price, and it will not be purchased? After he slaughtered it and cut it, it did not meet the specified weight. Is this condition valid or not?
Answer
I say, and with God's help: Such a sale is invalid and is not permissible according to Islamic law; due to the ignorance, ambiguity, and dispute it contains, and God knows best.
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