وَكَأْسًا دِهَاقًا
Sentence structure
The list of rewards continues. كَأْسًا is another coordinated accusative noun, and دِهَاقًا is its accusative adjective, describing the cup as full.
وَكَأْسًۭا — and a cup
Grammar: وَ is a conjunction. كَأْسًا is an indefinite masculine singular accusative noun, coordinated with كَوَاعِبَ.
دِهَاقًۭا — full
Grammar: An indefinite masculine singular accusative adjective describing كَأْسًا.