The earliest that I found with a 30 second Google Books trawl was 1882, in a book by Frank Hugh Foster.
The title of the book?
"The Doctrine of the Transcendent Use of the Principle of Causality in Kant, Herbart and Lotze."
Ah, Kant.
So you can guess why it used "in and of itself". The whole sentence was "Yet it is what it is in and of itself, as every other principle or thing is."
So a double-word score for managing to have "it is what it is" in the sentence as well.
Later on the same page: "Similarly, it is true of the passive power, that it is as passive the same, and not the same with itself."
Philosophers and theologians: giving LLMs a run for their money for nigh on 3 millennia.
And the LLMs are almost certainly trained on this stuff. Frank Hugh Foster is out of copyright. There's a happy thought for the day.
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