A clause occurring in one route but not another may reflect abridgement, partial retention, or a genuine difference in preservation. Difference alone establishes neither the correctness of the addition nor error in the shorter report. Muslim records the difference explicitly. Al-Nawawī also describes the widely transmitted core warning as mutawātir; this does not, by itself, authenticate every individual chain or wording variation.
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Omission alone does not prove a hidden defect
The Grave Warning Against Lying About the Prophet: Narration, Intent and Critical Duty
A clause occurring in one route but not another may reflect abridgement, partial retention, or a genuine difference in preservation. Difference alone establishes neither the correctness of the addition nor error in the shorter report. Muslim records the difference explicitly. Al-Nawawī also describes the widely transmitted core warning as mutawātir; this does not, by itself, authenticate every individual chain or wording variation.