Gharāʾib are reports outside the familiar range of transmissions. A rare addition from a reliable authority is not inherently fabricated, but unusual material from a questioned transmitter warrants comparison with established routes.
Ayyūb is expressing methodological caution, not giving a separate fully argued verdict on every unknown wording. Comparison with other transmission evidence determines the force of the concern.
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Reports of ʿAmr ibn ʿUbayd: Attribution, Conflicting Accounts and Evidence of Criticism
Gharāʾib are reports outside the familiar range of transmissions. A rare addition from a reliable authority is not inherently fabricated, but unusual material from a questioned transmitter warrants comparison with established routes.
Ayyūb is expressing methodological caution, not giving a separate fully argued verdict on every unknown wording. Comparison with other transmission evidence determines the force of the concern.