ولا يجوز بيع دود القز إلا أن يكون مع القز
Translation: The sale of silkworms is not permitted unless they are with the silk.
Dud al-qazz are silkworms, while al-qazz denotes silk or its material. Quduri distinguishes selling the worms alone from selling them together with the silk.
In the classical rationale, the silk is the principal economically useful subject, and the associated worms can be treated as an accessory rather than the sole object of sale.
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Silkworms and silk as an accessory
Kitab al-Buyu: Animal Sales, Silkworms, Bees and Dhimmi Transactions
ولا يجوز بيع دود القز إلا أن يكون مع القز
Translation: The sale of silkworms is not permitted unless they are with the silk.
Dud al-qazz are silkworms, while al-qazz denotes silk or its material. Quduri distinguishes selling the worms alone from selling them together with the silk.
In the classical rationale, the silk is the principal economically useful subject, and the associated worms can be treated as an accessory rather than the sole object of sale.