L. M. Grant's Commentary on the Bible - Genesis 25:1-34
OTHER GENERATIONS OF ABRAHAM We are not told what time Abraham took Keturah as a wife. Of course, God could enable him to be a father of children even after Sarah had died, but in this case he would be over 137 years, and nothing is given to enlighten us in this matter. However, verses 1-4 tell us that Keturah bore Abraham six sons, and that some of these also had sons afterward. whenever they were born, they were not considered by God as having any place compared to Isaac. Abraham gave all... read more
Geneva Study Bible - Genesis 25:1
25:1 Then again Abraham {a} took a wife, and her name [was] Keturah.(a) While Sarah was yet alive. read more