إن السماحة والمروءة والندى في قبة ضربت على ابن الحشرج
Generosity, honour, and open-handedness are in a tent erected over Ibn al-Ḥashraj.
The qualities are named explicitly. The kināyah lies instead in the indirect attribution to Ibn al-Ḥashraj: qualities are placed in the tent occupied by him, thereby being associated with its occupant.
The purpose is to praise Ibn al-Ḥashraj, not merely to define generosity.