فإن قال لفلان علي شيء لزمه أن يبين ما له قيمة
If someone says, 'I owe so-and-so something,' the speaker must specify something of recognized value.
Although shayʾ (something) is a broad expression, in this context it acknowledges a financial obligation. Explaining it by naming an utterly valueless or non-recognized object does not satisfy that obligation.
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What does shayʾ establish?
Kitab al-Iqrar: Capacity, Unspecified Rights, and Amounts in Admissions
فإن قال لفلان علي شيء لزمه أن يبين ما له قيمة
If someone says, 'I owe so-and-so something,' the speaker must specify something of recognized value.
Although shayʾ (something) is a broad expression, in this context it acknowledges a financial obligation. Explaining it by naming an utterly valueless or non-recognized object does not satisfy that obligation.