Galatians 4:21-31 - Hagar And Sarah Represent Two Covenants
21 Tell me, you who are keen to be under the Law, will you not listen to the Law? 22 Surely it is written in the Law that Abraham had two sons, one by the slave-woman and one by the free-woman; 23 but while the son of the slave-woman was born by the flesh, the son of the free-woman was born by the promise. 24 Now this is an allegory. The women are two covenants. One comes from mount Sinai, bearing children for servitude; that is Hagar, 25 for mount Sinai is away in Arabia. She corresponds to the present Jerusalem, for the latter is in servitude with her children. 26 But the Jerusalem on high is free, and she is 'our' mother. 27 For it is written, Rejoice, O thou barren who bearest not, break into joy, thou who travailest not; for the children of the desolate woman are far more than of the married.
28 Now you are the children of the Promise, brothers, like Isaac; 29 but just as in the old days the son born by the flesh persecuted the son born by the Spirit, so it is still to-day. 30 However, what does the scripture say? Put away the slave-woman and her son, for the son of the slave-woman shall not be heir along with the son of the free-woman.
31 Hence we are children of no slave-woman, my brothers, but of the free-woman,