Yitzhak Magen's excavations on the summit of Gerizim recovered a sacred precinct considerably larger and older than the polemical Jewish and Samaritan sources on either side had prepared scholars to expect, with construction phases running from the Persian period through the Hellenistic, centuries before the doctrinal arguments that later defined the split were even being made in their present form. The scale of what was found there, a substantial temple complex with extensive associated animal bone deposits consistent with regular sacrificial worship, makes clear that Gerizim was a working religious center in its own right and not merely a claim invented to rival Jerusalem after the fact.
The textual side of the dispute is built with equal deliberateness. The Samaritan Pentateuch does not simply interpret an ambiguous verse in Gerizim's favor, it constructs a tenth commandment from verses that exist elsewhere in the shared text, compiled and relocated so that the command to build an altar on Gerizim appears within the Decalogue itself rather than as a later, lesser instruction, giving the location the same scriptural weight as the commandments against theft or false witness. The Hasmonean destruction of the precinct in the second century BCE, which the excavation's destruction layer corroborates independently of any textual account, is the injury Samaritan tradition has organized its memory of the dispute around ever since.