أَوْفَى خَالِدٌ بِوَعْدِهِ. الْوَفَاءُ خُلُقٌ كَرِيمٌ.
Khalid kept his promise. Keeping promises is a noble trait.
The second clause supports the particular event by placing it under a general evaluative judgment. That supports an analysis of tadhyīl. Yet not every general statement is an epilogue of this kind: a later clause may instead provide an explanation of the earlier event’s cause.
Here the general maxim concerns the very trait illustrated by the report. If the appended generality were about an unrelated virtue, its general form alone would not create the required reinforcing connection.