Genesis 50:10

And they came to the threshing-floor of Atad, which is beyond Jordan, on the east side of the river, the caravan finding it advantageous to travel around the Dead Sea; and there they mourned with a great and very sore lamentation; and he made a mourning for his father seven days. As distinguished from the official period of mourning in Egypt, this was a week of weeping with the chanting of dirges.