يَا رُوَاةَ الْقَرِيضِ وَأُسَاةَ الْقَرِيضِ
O transmitters of poetry and physicians of poetry!
Ruwāt al-qarīḍ / usāt al-qarīḍ address preservers of poetry and practitioners who can diagnose or correct it. The repeated genitive structure creates two audible beats while distinguishing recitation from criticism.
The effect is social as well as musical: the speaker credits his listeners with literary authority and prepares to ask them to exercise it. Parallel phrasing need not be counted as a single rhyme trick; it can organize the audience into complementary roles.