Job 1:4

His sons went and feasted in their houses Or made a family feast, to testify and maintain their brotherly love. Every one his day Not every day of the week and of the year, which would have been burdensome to them all, and gross luxury, and which certainly such a holy man as Job would not have permitted; but each his appointed day, perhaps his birth- day, or the first day of the month. It is certain the same expression, יומו, jomo, his day, means his birth-day, Job 3:1. “The verse,” says Dr. Dodd, “might be rendered, And his sons had a constant custom to make a family feast, every one on his birth-day; and they sent and invited their three sisters,” &c. According to Herodotus, the inhabitants of the East in general, and especially the Persians, were remarkable for celebrating their birthdays with great festivity and luxury.