«أما الاقتباس فهو أن يضمن الكلام شيئا من القرآن أو الحديث لا على أنه منه»
Iqtibās means placing something from the Qur’an or Hadith within a composition, not by formally introducing it as a quotation from that source.
Iqtibās is the incorporation of wording from the Qur’an or Hadith into one’s own prose or verse, in a way that makes the borrowed wording function within the new composition rather than merely introducing it as a formally cited report.
It occurs in prose and poetry. Its decisive feature is the source of the words: Qur’an or Hadith. Incorporating a poet’s verse instead belongs under taḍmīn, not this specific definition.