«وَمِنْهُ السَّجْعُ، وَهُوَ تَوَاطُؤُ الْفَاصِلَتَيْنِ مِنَ النَّثْرِ عَلَى حَرْفٍ وَاحِدٍ»
“Sajʿ is the agreement of two prose clause-endings on a common letter.”
A fāṣilah is the terminal expression of a prose segment. Sajʿ resembles rhyme, but its primary rhetorical setting is prose; poetic end-rhyme has its own conventional classification.
The best examples retain a coherent and balanced meaning. Merely forcing clauses to end with the same letter can diminish rather than enhance eloquence.