Albert Barnes Commentary Job 1:13

"And it fell on a day when his sons and his daughters were eating and drinking wine in their eldest brother`s house," — Job 1:13 (ASV)

And there was a day - That is, on the day on which the regular turn came for the banquet to be held in the house of the older brother; compare the notes at (Job 1:4).

And drinking wine - This circumstance is omitted in (Job 1:4). It shows that wine was regarded as an essential part of the banquet, and it was from its use that Job apprehended the unhappy results referred to in (Job 1:5).