Galatians 4:23-25
4:23 But one, the son by the slave woman, was born by natural descent, 1 while the other, the son by the free woman, was born through the promise.
4:24 These things may be treated as an allegory, 2 for these women represent two covenants. One is from Mount Sinai bearing children for slavery; this is Hagar.
4:25 Now Hagar represents Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is in slavery with her children.
1 tn Grk “born according to the flesh”; BDAG 916 s.v. σάρξ 4 has “Of natural descent τὰ τέκνα τῆς σαρκός children by natural descent Ro 9:8 (opp. τὰ τέκνα τῆς ἐπαγγελίας). ὁ μὲν ἐκ τῆς παιδίσκης κατὰ σάρκα γεγέννηται Gal 4:23; cp. vs. 29.”
2 tn Grk “which things are spoken about allegorically.” Paul is not saying the OT account is an allegory, but rather that he is constructing an allegory based on the OT account.