The name it admits it added
Exodus 6:2–3
God tells Moses he appeared to Abraham, Isaac and Jacob as El Shaddai — and that “by my name JEHOVAH was I not known to them.”
Yet Genesis freely puts the name Yahweh in the patriarchs’ mouths. The text confesses the name is later even as an earlier layer uses it anyway. The retrojection is caught in the act.
The edit you can watch happen
Deuteronomy 32:8–9
Dead Sea Scrolls · 4QDeut
“sons of God”
Septuagint · Greek
“angels / sons of God”
Masoretic Text · medieval standard
“sons of Israel”
The older copies divide the nations among the sons of God; the later standard text swaps in sons of Israel, sanding off the polytheistic reading. Emanuel Tov — editor of the Scrolls’ publication, not a critic of the tradition — treats it as a deliberate anti-polytheistic alteration. Both readings survive, so the change is visible.
Prophecy written after the fact
Daniel · 2nd century BCE
Framed in the 6th-century court of Babylon and Persia, Daniel forecasts the wars of the Hellenistic kingdoms in fine grain — accurate right up to the 160s BCE, then abruptly wrong about what came next.
The natural reading: it was composed around 165 BCE and dated back four centuries, so that history already lived could be sold as prophecy foretold.