Romans 3:25
Romans 3:2525God presented Him as the atoning sacrifice through faith in His blood, in order to demonstrate His righteousness, because in His forbearance He had passed over the sins committed beforehand.
Watchtower commentary takes as describing Jesus as the propitiatory means by which sins are atoned. The "ransom paid by Christ Jesus" (NWT 3:24) is the sacrificial cost that satisfies divine justice for Adamic sin; Christ's blood is the basis on which God forbearingly passed over sins. The Watchtower's broader ransom theology — the exact-equivalent perfect-man sacrifice — is anchored here.
This verse is the engine of penal substitution. Hilastērion ("propitiation," "mercy seat") is the Old Testament cover of the ark on which the high priest sprinkled blood on the Day of Atonement (Lev 16). Paul says God "presented" Christ as THIS — the place where the wrath against sin is absorbed and mercy is extended. "Through faith in his blood" — the mechanism is faith; the basis is blood. And v25 explains why the cross was needed: it demonstrates God's righteousness in the face of his prior forbearance. He had been letting sins go without punishment in the OT era. The cross vindicates that forbearance — God was not soft on sin; he was waiting for the substitute. Justice paid; mercy extended. Both, in one event.
The NWT renders hilastērion as "an offering for propitiation" — consensus reads "a propitiation" (ESV/NASB/KJV) or "a sacrifice of atonement" (NIV). The expansion into "an offering for" subtly shifts hilastērion from the propitiating reality (the mercy seat itself) to a means or instrument of achieving it. This flattens the OT typology — Christ IS the mercy seat where blood is sprinkled, not merely an offering presented at it. The change is interpretive, not lexical.