Keturah = increase. We can see indeed she was blessed with an increase with her sons she had with Abraham.
Keturah remained with Abraham until he died.
Keturah never reached the status of Sarah, even after Sarah was dead. But because of Sarah, Hagar, and Keturah, Abraham became the “father of many nations,” as God had promised, by means of his sons and their descendants.
Genesis 25:1 Then again Abraham took a wife,
(= another, instead of "again")
and her name was Keturah.
(= increase, the second wife after Sarah's death.
Abraham was one hundred and forty years old when he married Keturah.)
2 And she bare him Zimran,
(= strife. Medan and Median were half-brothers with Ismael, and they were mixed up together in their dealings. See note on 37:25,28 and cp. 16:12; 17:20)
(= left behind)
It is of great importance that those who desire a deeper understand of God's Word pay attention to the genealogies of the Bible. For it is in them where we see that the Lineage of Jesus Christ was not polluted. Satan tried it with the giants, he will try it with the Canaanites, but Abraham put a stop to it.
Medan and Midian were half-brothers with Ishmael, and they were mixed together in most of their dealings. We will see in Genesis 37:25 where the Ishmaelites are called Midianites, for they were so mixed that the only way to distinguishing between them was through their nose rings. Though both tribes, or nations were from Abraham, the Ishmaelites were from Abraham by Hagar, the Egyptian.
Many teachers of the Bible teach that Moses married a daughter of a Kenite, however we read in Exodus 3:1; Now Moses kept the flock of Jethro his father in law, the priest of Midian: and he led the flock to the backside of the desert, and came to the mountain of God, even to Horeb." Notice that Jethro is a title, while Midian is the tribe that Moses' father in law was part of.
Then in Exodus 18:1: "When Jethro, the priest of Midian, Moses' father in law, heard of all that God had done for Moses..." This is also a second witness to the fact that Moses' Father-in-law was a Midian priest; and for his real name it is given in Exodus 2:18, and Numbers 10:29. Moses' father in law's name was "Reuel", and the fact that he was a priest of Midian, shows he was from the stock of Abraham. For Midian was the son of Abraham, through his wife "Keturah".
So we see that Moses married a daughter of Abraham, by Katurah, and not some Kenite, who are the offspring of Satan, through Cain. "Reuel" lived in the land of the Kenites, and held the title of Jethro. Just because Abraham lived in the land of the "Canaanites" did not make Abraham a Canaanite.
It is important that we understand whether the name is attached from a geographic location, or from their birthright. Anyone who challenges the bloodline of Jesus Christ is ignorant of the Word of God, and is taking liberties that makes him a heretic, placing themself in a dangerous position before the Lord. Mark him well.)
3 And Jokshan begat Sheba,
(= seven, or oath)
(= low country)
And the sons of Dedan were Asshurim,
4 And the sons of Midian; Ephah,
(= father of knowledge)
(= favored of God)
All these were the children of Keturah.
(Midian again is the tribe that Moses will marry into. So we see Abraham didn't count it finished at the age of one hundred and forty, and his family grew. These children of Abraham are overlooked by most Bible teachers, and their tribes, or nations are rated among the heathen nations, instead of being considered of Abraham.)
5 And Abraham gave all that he had unto Isaac.
6 But unto the sons of the concubines, which Abraham had, Abraham gave gifts, and sent them away from Isaac his son, while he yet lived, eastward, unto the east country.
7 And these are the days of the years of Abraham's life which he lived, an hundred threescore and fifteen years."
Abraham lived one hundred seventy five years. He was a sojourner, or traveler for one hundred years, as he left his family in Haran when he was seventy five. Abraham had Isaac at the age of one hundred, and married Keturah when he was one hundred and forty years old. So Abraham lived another thirty five years after the marriage to Keturah to sire these sons to her.
Remember, Abraham was seventy five years old when God gave him the unconditional promise. Abraham lived exactly one hundred years after the promise, and in Biblical numerics one hundred symbolizes "the children of the promise".
Keturah is also mentioned in Chronicles:
1 Chronicles 1:32 Now the sons of Keturah, Abraham's concubine: she bare Zimran, and Jokshan, and Medan, and Midian, and Ishbak, and Shuah. And the sons of Jokshan; Sheba, and Dedan.
(Following the death of Sarah, Abraham took a second wife, Keturah, who gave Abraham twelve more sons. These twelve sons would not receive any part of the Covenant promise that God put on Isaac, but God would bless then anyway. We recognize many of these names as heads of Arabic nations and lands even today.)
33 And the sons of Midian; Ephah, and Epher, and Henoch, and Abida, and Eldaah. All these are the sons of Keturah.
(These children of Midian, the Midianites were the last nation that the children of Israel would face in battle before crossing the Jordan river, and going in to take the land of Canaan. The land of the Midianites was in the area east of the Jordan river.)