Job 1:4

And his sons went and feasted in their houses, every one his day; and sent and called for their three sisters to eat and to drink with them.

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 appointment at certain times in their own houses, and had friendly and family entertainments in turn; for such were their feasts, not designed for intemperance, luxury, and wantonness, for then they would not have been encouraged, nor even connived at, by Job; but to cherish love and affection, and maintain harmony and unity among themselves, which must be very pleasing to their parent; for a pleasant thing it is for any, and especially for parents, to behold brethren dwelling together in unity, Ps 133:1, besides, these feasts were kept, not in public houses, much less in houses of ill fame, but in their own houses, among themselves, at certain seasons, which they took in turn; and these were either at their time of sheep shearing, which was a time of feasting, 1 Samuel 25:2, or at the weaning of a child, Genesis 21:8, or rather on each of their birthdays, which in those early times were observed, especially those of persons of figure, Genesis 40:20, and the rather, as Job's birthday is called his day, as here, Job 3:1,

and sent and called for their three sisters to eat and to drink with them; not to make a feast in their turn, but to partake of their entertainment; which, as is commonly observed, showed humanity, kindness, tenderness, and affection in them to their sisters, to invite them to take part with them in their innocent and social recreations, and modesty in their sisters not to thrust themselves into their company, or go without an invitation; these very probably were with Job, and went to the feasts with his leave, being very likely unmarried, or otherwise their husbands would have been invited also.