Quduri frames the issue through the historical sale of an enslaved person. This is a historical legal illustration, not an endorsement of human ownership today.
For understanding the contractual principle, imagine a lawful item sold on credit and an agreed pledge of a particular ornament to secure the unpaid price. The sale and the promised security are related but different legal obligations.
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The original historical sale example
Kitab al-Rahn: Two Pledgees, Conditional Security and Custody
Quduri frames the issue through the historical sale of an enslaved person. This is a historical legal illustration, not an endorsement of human ownership today.
For understanding the contractual principle, imagine a lawful item sold on credit and an agreed pledge of a particular ornament to secure the unpaid price. The sale and the promised security are related but different legal obligations.