Genesis 25:1
25:1 Then again Abraham {a} took a wife, and her name [was]
     Keturah.

     (a) While Sarah was yet alive.

Genesis 25:6
25:6 But unto the {b} sons of the {c} concubines, which Abraham
     had, Abraham {d} gave gifts, and sent them away from Isaac
     his son, while he yet lived, eastward, unto the east
     country.

     (b) For by virtue of God's word he not only had Isaac, but
         begat many more.
     (c) See Genesis 22:24.
     (d) To avoid the disputing that otherwise might have come
         because of the heritage.

Genesis 25:17
25:17 And these [are] the years of the life of Ishmael, an
      hundred and thirty and seven years: and he gave up the
      ghost and died; and was gathered unto his {f} people.

      (f) Who dwelt among the Arabians, and were separate from
          the blessed seed.

Genesis 25:18
25:18 And they dwelt from Havilah unto Shur, that [is] before
      Egypt, as thou goest toward Assyria: [and] he died {g} in
      the presence of all his brethren.

      (g) He means that his lot fell to dwell among his brethren
          as the angel promised.

Genesis 25:22
25:22 And the children struggled together within her; and she
      said, If [it be] so, why [am] I {h} thus?  And she went
      {i} to enquire of the LORD.

      (h) That is, with child, seeing one shall destroy another.
      (i) For that is the only refuge in all our miseries.

Genesis 25:32
25:32 And Esau said, Behold, I [am] at the point to die: and
      what {k} profit shall this birthright do to me?

      (k) The reprobate do not value God's benefits unless they
          feel them presently, and therefore they prefer present
          pleasures.

Genesis 25:33
25:33 And Jacob said, Swear to me this day; and he sware unto
      him: and he {l} sold his birthright unto Jacob.

      (l) Thus the wicked prefer their worldly conveniences over
          God's spiritual graces: but the children of God do the
          opposite.