The Torah's bookkeeping of Abraham's later life is precise. He had taken another wife after Sarah, Keturah, and by her and his concubines there were sons. The inheritance had to be sorted. Targum Pseudo-Jonathan on Genesis 25:6 describes how.
"To the sons of the concubines of Abraham, Abraham gave riches and moveable property as gifts, and sent them away from Isaac his son while he yet lived; and they went and dwelt eastward in the land of the orient."
Read the Aramaic verbs. Abraham gave. Abraham sent. He did not wait until his death and let the estate fight itself out. He did it while he was still alive, with the authority of the father in the room. Every son got a share. No son was abandoned. And yet only one son — Isaac — received the covenantal land and the covenantal promise.
The sages noticed how generous and how firm this was at the same time. Generosity without firmness produces confusion. Firmness without generosity produces bitterness. Abraham did both. He loaded the other sons with wealth and sent them east with honor. He protected Isaac's inheritance from dilution.
"The land of the orient" — the Targum's phrase for the east — becomes a resonant space in later Jewish tradition. The Bnei Kedem, the children of the East, appear repeatedly as the keepers of ancient wisdom, sometimes friendly and sometimes hostile, but always connected by blood to the house of Abraham.
The lesson: the covenant is specific, but the blessing is wide. Abraham's name spread in all directions. Only the promise stayed in one place. A good father knows the difference.