While it seems natural/logical that the Creator of the World would use words precisely, from whence do we learn this concept? Is it derived from the Written Torah or is it part of the Oral Torah?
I do not agree with the blanket statement "the Torah does not mince words".
The dictionary defines this as
to say what you mean clearly and directly, even if you upset people by doing this.
The Torah often does not talk clearly and directly - examples that come to mind are:
The Torah is often careful to protect people's identity. Take the cases of:
- Bnoth Zelofchod who never divulge what sin their father did. The Tanah who tried to identify him was reprimanded for doing so.
- The Mekoshesh Eitzim - no mention of his identity or even the tribe he came from.
The Torah sometimes fudges the details of sins.
- The entire first paragraph of Sefer Devorim is a coded rebuke for numerous sins.
Hashem himself (the author of the Torah) is known to fudge details.
- Misreporting to Abraham what Sarah said about his vintage.
You can claim that the Torah is concise and every word has its purpose - but that's not called "not mincing words".