Commentaries:
Jamieson, Fausset, and Brown
This verse stands instead of the sentence which we should expect, to correspond to Galatians 4:24, "One from Mount Sinai," namely, the other covenant from the heavenly mount above, which is (answers in the allegory to) Sarah.
Jerusalem . . . above— (Hebrews 12:22), "the heavenly Jerusalem." "New Jerusalem, which cometh down out of heaven from my God" (Revelation 3:12; Revelation 21:2). Here "the Messianic theocracy, which before Christ's second appearing is the Church, and after it, Christ's kingdom of glory" [MEYER].
free—as Sarah was; opposed to "she is in bondage" (Galatians 4:25).
all—omitted in many of the oldest manuscripts, though supported by some. "Mother of us," namely, believers who are already members of the invisible Church, the heavenly Jerusalem, hereafter to be manifested (Hebrews 12:22).
Other Jamieson, Fausset, and Brown entries containing Galatians 4:26:
Song of Solomon 3:4
Song of Solomon 6:9
Ezekiel 16:61
John 8:35
Galatians 3:6
Galatians 4:28
Philippians 3:14
Revelation 17:5
Revelation 21:2
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