All three may involve earlier wording, but they differ in source, attribution, and use.
FormKey diagnostic feature
IqtibasScripture or hadith wording embedded in discourse
TadmeenA portion of another poet's verse incorporated into new poetry
Naskh and intihalAnother's work reproduced and presented as one's own
Incorporating an acknowledged verse and concealing its origin while claiming the entire work are not the same act.
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Conclusion: Literary Borrowing, Iqtibas, Tadmeen, and the Final Arts of Composition
All three may involve earlier wording, but they differ in source, attribution, and use.
FormKey diagnostic feature
IqtibasScripture or hadith wording embedded in discourse
TadmeenA portion of another poet's verse incorporated into new poetry
Naskh and intihalAnother's work reproduced and presented as one's own
Incorporating an acknowledged verse and concealing its origin while claiming the entire work are not the same act.