«وَقُبَالَتَهُمَا خَابِيَةُ نَبِيذٍ»
Before the two stood a jar of nabīdh.
Khābiyah is a large storage jar. Nabīdh historically could denote a drink made by steeping items such as dates in water; this word alone does not establish whether the particular drink was intoxicating.
The narrative focus is the perceived contrast between an austere public performance and a comfortable private scene, not an unsupported legal verdict about the drink.