The phrase "a final testimony" is correct and usable in written English.
It can be used when referring to a concluding statement or declaration, often in a legal, personal, or formal context.
Example: "In her will, she included a final testimony of her love for her family and friends."
Alternatives: "a concluding statement" or "a last declaration."
Mr. Patterson's last statement was a final testimony to his mental condition: "Statement to what?
Iommi's flawless technique was especially inspiring; he announced a cancer diagnosis in 2012 and this tour is partially considered a final testimony to his legacy.
…[A] dense and illuminating filmed interview structured as an alphabet primer (A as in 'Animal,' B as in 'Boire,' C as in 'Culture'...)… it's not a standard interview but a final testimony, with an interlocutor who serves expertly as muse.
While "Lazarus" and many other moments on the very recently released Blackstar will likely offer far more in the way of obvious poignancy, to me, "Where Are We Now?" is a far more heartbreaking final testimony.
He was giving his final testimony in a trial in which he has so far barely spoken since it started on 10 January.
"Kuchu" now becomes even more important as it has become the final testimony of a courageous man who laid the foundation of LGBT activism in Uganda, and whose work continues to live on - and inspire others - to this day.
The place where Rosenberg was killed became a shrine, with a large wooden cross and signs reading "You didn't die in vain!" Protesters erected a movie screen and broadcast Rosenberg's final testimony, so that his body and voice floated over the crowd.
As the Iraq Study Group finished its meetings in Washington, it heard final testimony from Senator John Kerry of Massachusetts, a Democrat who has urged a specific timeline for withdrawal, and Senator John McCain of Arizona, who has called for a significant bolstering of troops to gain control of the Iraqi capital.
"He has left us with a magnificent 'Parsifal' under his arm as his final testimony," wrote Juan A. Vela del Campo, music critic of the Madrid daily, El País.
Mr. Bo's final testimony added to the soap opera-like twists in a trial that provided an unusual showcase of how China manages its legal system.
The final testimony is now interpreted by many, including the writer's descendants, as a request that he should not have the kind of grand mausoleum popular in Victorian times.
