ثم احتاجوا لمعرفة توابع البلاغة إلى علم آخر فوضعوا لذلك علم البديع
They then needed another discipline to understand subsidiary enhancements of balagha, and thus established ʿilm al-badiʿ.
Badiʿ studies devices that add beauty to discourse after the central requirements of fasaha and contextual suitability have been met. Verbal symmetry, semantic contrast and related refinements belong here.
The order matters. Rhyme, wordplay or numerous ornamental devices cannot by themselves make linguistically defective or contextually inappropriate speech eloquent. Foundational suitability precedes additional ornament.