John Gills Exposition of the Bible Commentary - Genesis 25:6
But unto the sons of the concubines which Abraham had ,.... These were Hagar and Keturah, though they are both called his wives, Genesis 16:3 ; yet they were concubines; so Keturah, 1 Chronicles 1:32 ; they were, as some render the word, "concubine wives" F5 הפילגשים "concubinarum uxorum", Junius & Tremellius, Piscator. ; they were half wives or secondary ones: the Jewish writers say that they were espoused, but not by writing, as wives were; they were under the lawful wife,... read more
Matthew Henry's Complete Commentary - Genesis 25:1-10
Abraham lived, after the marriage of Isaac, thirty-five years, and all that is recorded concerning him during the 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 best and greatest saints, are not eminent days, some slide on silently, and neither come nor go with observation; such were these last days of Abraham. We have here, I. An account of his children by Keturah, another wife whom he married... read more