“Fifty except twenty” as a valid continuous admission acknowledges thirty; it is not a complete acknowledgment of fifty followed by withdrawal of twenty.
This explains two points. The exception is construed with the original utterance, and the creditor's recognized right is based on its net meaning. By contrast, a later independent assertion that the speaker made a mistake or changed his mind cannot automatically be treated as a connected exception.
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An exception is not cancellation of an admission
Kitab al-Iqrar: Connected Exceptions, Quantities, and Cross-Category Exceptions
“Fifty except twenty” as a valid continuous admission acknowledges thirty; it is not a complete acknowledgment of fifty followed by withdrawal of twenty.
This explains two points. The exception is construed with the original utterance, and the creditor's recognized right is based on its net meaning. By contrast, a later independent assertion that the speaker made a mistake or changed his mind cannot automatically be treated as a connected exception.