On Justin Martyr to Trypho, A Jew

"But if you [a Jew] remain hard-hearted, or weak in [forming] a resolution, on account of death, which is the lot of the Christians, and are unwilling to assent to the truth, you shall appear as the authors of your own [evils]. And you deceive yourselves while you fancy that, because you are the seed of Abraham after the flesh, therefore you shall fully inherit the good things announced to be bestowed by God through Christ.

For no one, not even of them, has anything to look for, but only those who in mind are assimilated to the faith of Abraham, and who have recognised all the mysteries: for I say, that some injunctions were laid on you in reference to the worship of God and practice of righteousness; but some injunctions and acts were likewise mentioned in reference to the mystery of Christ, on account of the hardness of your people’s hearts.

And that this is so, God makes known in Ezekiel, [when] He said concerning it: ‘If Noah and Jacob and Daniel should beg either sons or daughters, the request would not be granted them.’ And in Isaiah, of the very same matter He spake thus: ‘The Lord God said, they shall both go forth and look on the members [of the bodies] of the men that have transgressed. For their worm shall not die, and their fire shall not be quenched, and they shall be a gazing-stock to all flesh.’

So that it becomes you to eradicate this hope from your souls, and hasten to know in what way forgiveness of sins, and a hope of inheriting the promised good things, shall be yours. But there is no other [way] than this, —to become acquainted with this Christ, to be washed in the fountain spoken of by Isaiah for the remission of sins; and for the rest, to live sinless lives.”

- Justin Martyr, Chapter XLIV.—The Jews In Vain Promise Themselves Salvation, In The Apostolic Fathers with Justin Martyr and Irenaeus. Ed. Philip Schaff, (Grand Rapids: William. B. Eerdmans Publishing Company, 2001).