Impressed by the elder's eloquence, the governor wishes to draw him close and appoint him to the dīwān al-inshāʾ, the office responsible for official correspondence and state compositions.
«فَمَلَأَ فَاهُ بِاللَّآلِي»
He filled his mouth with pearls.
The image conveys lavish reward and appreciation. Yet a reward for a feat and a lasting government appointment are different matters. The latter would give the elder a place within official administration—and therefore another kind of obligation.