The cases of Ghālib and Hishām teach evidentiary comparison. One contrasts oral dictation with written notes; the other contrasts earlier and later chain claims. Investigate when each form was documented, who heard it, and whether a reliable explanation exists for a change.
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Two kinds of evidence for a chain
Narrator Criticism, Integrity and Precision: Standards of Scholarly Appraisal
The cases of Ghālib and Hishām teach evidentiary comparison. One contrasts oral dictation with written notes; the other contrasts earlier and later chain claims. Investigate when each form was documented, who heard it, and whether a reliable explanation exists for a change.