used only in Gal. 4:24, where the apostle refers to the history
of Isaac the free-born, and Ishmael the slave-born, and makes
use of it allegorically.

Every parable is an allegory. Nathan (2 Sam. 12:1-4) addresses
David in an allegorical narrative. In the eightieth Psalm there
is a beautiful allegory: "Thou broughtest a vine out of Egypt,"
etc. In Eccl. 12:2-6, there is a striking allegorical
description of old age.