Why is “God said: fa-ṣabrun jamīl” treated differently from literary iqtibās here?

Iqtibās and Taḍmīn: Quoting Scripture and Incorporating Poetry

• Its entire Qur’anic meaning has been altered
• It is solely an example of complete paronomasia
• It announces the source and presents the words as a citation
• It is a borrowed hemistich from another poet