Charles Ellicott Commentary Genesis 25:6

"But unto the sons of the concubines, that Abraham had, Abraham gave gifts. And he sent them away from Isaac his son, while he yet lived, eastward, unto the east country." — Genesis 25:6 (ASV)

The east country. —By this is meant Arabia and Southern Mesopotamia, where, by their superior vigour and organisation, the descendants of Abraham were able to establish their supremacy over the natives. Burckhardt tells us that Bedouins still follow Abraham’s practice. When their children are grown up, they give each of the younger sons his share of their goods (Luke 15:12), whereupon they move to a distance, and leave the eldest brother in quiet possession of the home.