Berean Standard Bible (BSB)
His son by the slave woman was born according to the flesh, but his son by the free woman was born through the promise.
World English Bible (WEB)
However, the son by the handmaid was born according to the flesh, but the son by the free woman was born through promise.
Strong's King James
But{G235} he{G3303} who was of{G1537} the bondwoman{G3814} was born{G1080}{(G5769)} after{G2596} the flesh{G4561}; but{G1161} he of{G1537} the freewoman{G1658} was by{G1223} promise{G1860}.
The F.O.G *
(23) But indeed the one of the female slave has been born according to flesh and the one of the free, through a promise-vow.
The F.O.G Message *
Young's Literal Translation
but he who is of the maid-servant, according to flesh hath been, and he who is of the free-woman, through the promise;