Verses 1–6
Descendants of Abraham and Ketura
Abraham has taken a second extra wife next to Hagar. Scripture is silent about it when that has happened. However, the Holy Spirit does not mention this connection and who came forth from it until now, after the connection between Isaac and Rebekah. In Abraham all the nations of the earth will be blessed (Genesis 12:2-Leviticus :). It has been said several times that his descendants will be like the sand which is on the seashore and like the stars of the heavens, which speaks of an earthly people (sand) and a heavenly people (stars).
Besides Isaac and Ishmael, we now find more sons. They represent the nations of the earth, all of which will also be blessed by what the LORD promised Abraham. The blessing for the whole earth will be enjoyed in the millennial kingdom of peace. That blessing will come through the son of the promise.
Abraham gives everything he has to Isaac, while there are gifts for the others. Thus God has given the Lord Jesus, as Heir of all things, all things into His hands. And He distributes it to others.
The others are sent away “eastward”, which in Genesis indicates being put aside. They are sent away from Isaac here, just like Ishmael before, but with gifts, just like Ishmael also got promises. There is also blessing for them. People who are bound to Israel by carnal bonds will be blessed in the kingdom of peace through Israel.