His sons used to go and hold a feast in the house of each one on his day, and they would send and invite their three sisters to eat and drink with them.
We have here a further account of Job's prosperity and his piety. I. His great comfort in his children is taken notice of as an instance of his prosperity; for our temporal comforts are borrowed, depend upon others, and are as those about us are. Job himself mentions it as one of the greatest joys of his prosperous estate that his children were about him, Job 29:5.
Commenting on Job 1:4-5
And his sons went and feasted in their houses, everyone his day,.... It appears by this that Job's sons were grown up to men's estate, that they were from him, and were for themselves, and carried on a separate business on their own accounts, and had houses of their own, and, perhaps, were married; and being at some distance from each other, they met by...
every one his day--namely, the birthday (Job 3:1). Implying the love and harmony of the members of the family, as contrasted with the ruin which soon broke up such a scene of happiness. The sisters are specified, as these feasts were not for revelry, which would be inconsistent with the presence of sisters. These latter were invited by the brothers, though they gave no invitations in return.