A connected in shāʾ Allāh formula qualifies the admission itself, preventing an unconditional binding admission under this classical rule.
A khiyār clause instead attempts to attach a later right to undo an already operative admission. That proposed option is invalid, but the underlying admission remains effective.
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Why divine-will wording and khiyār have different outcomes
Kitab al-Iqrar: Conjoined Amounts, Divine-Will Clauses, and Options
A connected in shāʾ Allāh formula qualifies the admission itself, preventing an unconditional binding admission under this classical rule.
A khiyār clause instead attempts to attach a later right to undo an already operative admission. That proposed option is invalid, but the underlying admission remains effective.