«وَالرَّسَائِلِ الْمُوَشَّحَةِ وَالْأَسَاجِيعِ الْمُسْتَمْلَحَةِ»
Ornamented epistles and delightful passages of rhymed prose.
Muwashshaḥah evokes adornment; asājīʿ is connected with sajʿ, patterned endings in prose that produce an audible cadence.
For example, the earlier pairing of al-inshāʾ / shāʾ gives the prose a rhyme-like effect. But effective sajʿ requires more than matching sounds. The paired clauses should also build a meaningful connection, so the ornament supports rather than overwhelms the message.