If a person redeems a Muslim captive by paying a ransom for him without the captive's explicit permission, is the captive liable to repay the buyer?

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If a person buys a captive from the spoils, the captive is liable to repay the price paid if the purchase was made with the captive's authorization; this is undisputed, as the buyer acts as the captive's representative. If the purchase was made without permission, the captive is still liable for the price according to Imam Ahmad, Al-Hasan, Al-Nakha'i, Al-Zuhri, Malik, and Al-Awza'i. This is because the captive is obligated to ransom himself to escape enemy control, so if another acts on his behalf, he must repay, similar to paying a debt the judge ruled against him.