Sometime around 155 AD, the Christian philosopher Justin Martyr published an account of a debate he claimed to have had with a Jewish man named Trypho - possibly to be identified with the rabbi Tarfon mentioned in the Mishnah, though this is uncertain. The Dialogue with Trypho is the earliest surviving extended theological exchange between a Christian and a Jewish interlocutor, and it covers precisely the questions at the heart of the Hebrew Roots debate: the status of the Torah, the meaning of circumcision, the obligation of the Sabbath, and the relationship between Israel's covenant and the community of Christ.

Justin was not an apostle. He was not writing scripture. But he was a careful, philosophically trained thinker who had converted from Greek paganism to Christianity and had thought deeply about the relationship between the two testaments. His arguments in the Dialogue are, in their structure and their substance, remarkably close to Paul's - which is significant precisely because Justin was not simply summarising Paul. He was thinking the problem through independently, in conversation with a Jewish dialogue partner, and reaching the same conclusions.

Who Was Justin Martyr?

Justin was born around 100 AD in Flavia Neapolis (modern Nablus) in Samaria, of pagan Greek parents. He describes in his First Apology a long intellectual journey through Stoicism, Aristotelianism, Pythagoreanism, and Platonism before his conversion to Christianity - which he presents not as an abandonment of philosophy but as its fulfilment. He founded a school in Rome, wrote extensively in defence of Christianity, and was martyred under Marcus Aurelius around 165 AD, giving him his epithet.

He is important for our purposes for two reasons: his date (mid-second century, close to the apostolic period), and his method (he engages the Jewish scriptures directly, argues from them, and does not simply assert Christian conclusions but attempts to demonstrate them from the text of the Torah and the Prophets).

The Structure of the Dialogue

The Dialogue with Trypho is a long document - one of the longest surviving early Christian texts. It covers an enormous range of topics: the insufficiency of Greek philosophy, the authority of the Hebrew prophets, the messianic meaning of the Psalms and Isaiah, the relationship between the two covenants, and the specific question of Torah observance for believers in Christ.

Trypho is not a straw man. He presses Justin seriously, raises objections, and does not simply capitulate. The exchange models genuine intellectual engagement across religious difference - which is itself significant for a document produced at a time when relations between church and synagogue were tense.

Justin on the Torah: Temporal, Typological, and Fulfilled

Justin's central argument about the Torah is that its legal requirements were given to Israel for specific, limited purposes - and that those purposes have now been fulfilled in Christ. He distinguishes between three types of content in the Mosaic law:

First, the eternal moral law - the commands that reflect God's own character and are therefore permanently binding on all humanity. These are not abrogated by Christ. They are deepened and internalised.

Second, the typological and prophetic content - the sacrifices, the priesthood, the feasts, the tabernacle - all of which were shadows pointing forward to Christ. These are not abrogated but fulfilled: their meaning is now fully visible in what they were always pointing to.

Third, the hardening legislation - commands given specifically because of Israel's hardness of heart, as a restraint on idolatry and a mark of ethnic distinction. Circumcision, Justin argues following Paul, was given as a sign, not a saving ordinance: "The circumcision according to the flesh, which is from Abraham, was given for a sign; that you might be separated from other nations, and from us; and that you alone might suffer that which you now justly suffer." - Dialogue 16

On the Sabbath specifically, Justin argues that righteous people before Moses - Abraham, Noah, Enoch - were not Sabbath-keepers, which means the Sabbath was not an eternal moral requirement but a command given to Israel at a specific time for specific purposes. The true Sabbath, he argues, is the rest found in Christ - the eschatological rest to which the weekly Sabbath was always pointing.

On Gentiles and Torah Obligation

Justin addresses the question of Gentile Torah obligation directly - and his answer is exactly what Paul gives in Romans and Galatians. Gentiles who believe in Christ are not required to observe the Mosaic law. Jewish Christians who wish to observe Torah for personal and cultural reasons may do so, provided they do not require Gentile believers to do the same:

"If some, through weak-mindedness, wish to observe such institutions as were given by Moses... along with their hope in this Christ... I hold that we ought to join ourselves to such, and associate with them in all things as kinsmen and brethren. But if some of your race... wish to observe... these institutions, and at the same time believe in this Jesus... and say that they will not live with the Gentiles who do not observe them, I do not approve of them." - Dialogue 47

This is the Nazarene position as distinct from the Ebionite position - Torah observance as personal custom is acceptable; Torah observance as binding obligation on all is not. Justin draws the line exactly where Paul drew it, independently and a century later, in the context of an actual debate with a Jewish interlocutor.

The New Covenant and the New Law

Justin's most extended argument concerns the new covenant of Jeremiah 31, which he treats as the key to understanding the relationship between the testaments. The new covenant does not simply renew the Mosaic covenant. It supersedes it. It is written on hearts rather than stone. It goes out to all nations rather than to one people. It requires a different kind of circumcision - of the heart - rather than the physical sign.

The "new law" of the new covenant, for Justin, is Christ himself - his teaching, his example, his Spirit dwelling in believers. This is not antinomianism. Justin is insistent that Christians are morally serious people. But the shape of that moral seriousness is determined by Christ and his Spirit, not by the Torah of Moses.

Why This Matters for the HRM

The Dialogue with Trypho matters for the HRM debate for several reasons. First, it demonstrates that the theological argument against Torah observance as Gentile obligation was being made systematically and rigorously within fifty years of the apostles' deaths, in dialogue with a Jewish critic, from the text of the Hebrew scriptures themselves. This is not Gentile ignorance of the Jewish background. It is careful, text-based engagement.

Second, it demonstrates that the distinction between Jewish Christians who observe Torah as personal custom and those who require it of Gentiles was established and articulated in the second century - not as a later compromise but as the considered position of the apostolic tradition as Justin received it.

Third, it shows that the arguments against Torah observance as Gentile obligation are not distinctively Pauline in origin - they arise independently from careful engagement with the Hebrew scriptures, from reflection on the nature of the new covenant, and from the logic of Christ's fulfilment of the typological content of the Torah. Justin is not simply echoing Paul. He is thinking the problem through from first principles and arriving at the same place.

The HRM must account for Justin. He is too early, too careful, too text-based, and too close to the apostolic period to be dismissed as a later Gentile corruption. And his conclusion - that Torah observance is not binding on Gentile believers in Christ - is the same conclusion the apostles reached, the Jerusalem Council formalised, and Ignatius assumed a generation before him.

For the law was given through Moses; grace and truth came through Jesus Christ. - John 1:17