Riverside(i)
22 For it is written that Abraham had two sons, one born of the slave girl and one born of the free wife.
23 But he who was born of the slave girl was born according to the flesh, while he who was born of the free wife was born by promise.
24 This is an allegory. For these women are the two covenants, one from Mount Sinai, bearing children for slavery. This is Hagar.
25 Hagar is Mount Sinai in Arabia. She represents the present Jerusalem, for she is in slavery along with her children.
26 But the Jerusalem on high is free and she is our mother.
27 For it is written, "Rejoice, O barren one, you who do not bear! Break forth and shout, you who feel no birth pangs! For many are the children of the desolate — more than those of her who has a husband."
28 But you, brethren, are, as Isaac was, children of promise.
29 But just as then he who was born according to the flesh persecuted him who was born according to the Spirit, so it is now.
30 But what says the Scripture? "Cast out the slave girl and her son. For the son of the slave girl shall not inherit along with the son of the free wife."
31 Therefore, brethren, we are not children of a slave girl, but of the free wife.