John 12:50
John 12:5050And I know that His command leads to eternal life. So I speak exactly what the Father has told Me to say.”
is not a verse JWs build any distinctive doctrine on. It surfaces in apologetic conversation when an outsider notices the NWT's "his commandment means everlasting life" and asks why the verb has shifted from "is" to "means." JW publications generally treat the verse as a description of the Father's word giving life through the Son, with no special handling of the copula.
Jesus says hē entolē autou zōē aiōnios estin — "his commandment is everlasting life." The verb is the bare copula estin and the natural English is "is." The verse closes a chapter where Jesus has been claiming an identity-level relationship to the Father — what the Father commanded, he speaks; the Father's commandment IS life. Standard English translations render "is everlasting life" without difficulty. The construction is the same identity statement form as ("God is light") and ("God is love"), where the NWT keeps "is" without trouble.
The NWT renders estin as "means" here — "his commandment means everlasting life" — the same swap it makes at the Last Supper verses and at 1 Cor 10:4. The verse is part of the NWT's wider pattern of softening identity copulas at points where the literal "is" would carry doctrinal weight: here the Father-Son-life identity, at the Last Supper the bread-body identity, at 1 Cor 10:4 the rock-Christ identity. The verb is the same in all four cases, and the NWT treats them consistently — but contrast , , and 1 Cor 12:27, where the same estin is translated "is" without hesitation. The trigger is the payload of the literal reading, not the grammar.