Genesis 25:1 Abraham took another wife, whose name was Keturah. She bore him Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. Jokshan fathered Sheba and Dedan. The sons of Dedan were Asshurim, Letushim, and Leummim. The sons of Midian were Ephah, Epher, Hanoch, Abida, and Eldaah. All these were the children of Keturah. Abraham gave all he had to Isaac. But to the sons of his concubines Abraham gave gifts, and while he was still living he sent them away from his son Isaac, eastward to the east country.
These are the days of the years of Abraham’s life, 175 years. Abraham breathed his last and died in a good old age, an old man and full of years, and was gathered to his people. Isaac and Ishmael his sons buried him in the cave of Machpelah, in the field of Ephron the son of Zohar the Hittite, east of Mamre, the field that Abraham purchased from the Hittites. There Abraham was buried, with Sarah his wife. After the death of Abraham, God blessed Isaac his son. And Isaac settled at Beer-lahai-roi.
Below are thoughts of this chapter in commentaries by various men of God. I have copied three of these to show how they varied in their views on this chapter. The last on, Henry, seemed to regard it best to me as the others try to explain why Abraham did or did not father these six sons before or after Sarah’s death.
Abraham’s Marriage to Keturah is generally supposed to have taken place after Sarah’s death, and his power to beget six sons at so advanced an age is attributed to the fact, that the Almighty had endowed him with new vital and reproductive energy for begetting the son of the promise. But there is no firm ground for this assumption; as it is not stated anywhere, that Abraham did not take Keturah as his wife till after Sarah’s death. It is merely an inference drawn from the fact, that it is not mentioned till afterwards; and it is taken for granted that the history is written in strictly chronological order. (Keil and Delitzsch)
Five and thirty years Abraham lived after the marriage of Isaac, and all that is recorded concerning him during that time lies here in a very few verses; we hear no more of God’s extraordinary appearances to him or trials of him; for all the days even of the greatest saints are not eminent; some slide on silently; such were these last days of Abraham. We have here an account of his children by Keturah, another wife, whom he married after the death of Sarah. He had buried Sarah, and married Isaac, the two dear companions of his life, and was now solitary; his family wanted a governess, and it was not good for him to be thus alone; he therefore marries again. By Keturah he had six sons, in whom the promise made to Abraham, concerning the great increase of his posterity, was in part fulfilled. The strength he received by the promise still remained in him, to show how much the virtue of the promise exceeds the power of nature. (Benson)
All the days, even of the best and greatest saints, are not remarkable days; some slide on silently; such were these last days of Abraham. Here is an account of Abraham’s children by Keturah, and the disposition which he made of his estate. After the birth of these sons, he set his house in order, with prudence and justice. He did this while he yet lived. It is wisdom for men to do what they find to do while they live, as far as they can. Abraham lived 175 years; just one hundred years after he came to Canaan; so long he was a sojourner in a strange country. Whether our stay in this life be long or short, it matters but little, provided we leave behind us a testimony to the faithfulness and goodness of the Lord, and a good example to our families. We are told that his sons Isaac and Ishmael buried him. It seems that Abraham had himself brought them together while he lived. Let us not close the history of the life of Abraham without blessing God for such a testimony of the triumph of faith. (Henry)