Matthew 15:6
Matthew 15:66he need not honor his father or mother with it. Thus you nullify the word of God for the sake of your tradition.
is paired with in JW publications as Jesus' own condemnation of human tradition. The verse — "you have made the word of God invalid because of your tradition" — is read as a categorical rejection of all tradition rather than a targeted rebuke of the specific Pharisaic ruling Jesus has just exposed (vv.4-5, the corban evasion of the fifth commandment).
Jesus is rebuking a specific tradition — the Pharisees' corban ruling that allowed a man to dedicate his property to the temple in such a way that it could no longer be used to support his parents, evading the fifth commandment. The whole pericope (vv.1-9) names the wrong precisely: a tradition that overrides God's word. Jesus does not condemn tradition as a category; he names the test ("invalidating the word of God") and applies it to the corban ruling. In the same Gospel he commands the apostles to teach "all that I have commanded you" (Matt 28:20) — that command is itself a tradition to be passed on. Paul uses the same word paradosis positively at 2 Thess 2:15 and 1 Cor 15:3. The test Jesus applies here is content, not age — a tradition that preserves God's word is good, one that overrides it is bad. The Watchtower's blanket rule against post-apostolic tradition fails the very test Jesus actually gives.
The NWT renders ēkurōsate ton logon tou theou as "you have made the word of God invalid" — defensible but slightly weaker than the consensus "void" or "nullified" (ESV: "you have made void the word of God"). "Invalid" reads as a procedural-legal term; the Greek is stronger, denoting abolition or annulment. The shift is subtle and not doctrinally decisive — the deeper interpretive point is that the Watchtower lifts the verse out of its corban context and applies it categorically, when Jesus himself applies it to a specific failed tradition by a specific named test.