attest to

Related to attest to: come off, for the most part, set out, come to terms, in line with, refer to, up to par

attest to

To confirm that something is true. I can attest to her whereabouts on the night of the crime—she was with me the entire time.
Farlex Dictionary of Idioms.

attest to something

to certify or bear witness to a fact. I cannot attest to what you have reported. The witness attested to the suspect's presence at the scene of the crime.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • on one's
  • on someone's
  • other than
  • other than (something)
  • out of one's
  • let something drop
  • #dead
  • (I've) got to go
  • do someone or something justice
  • a lulu
References in periodicals archive
Though they cannot be shown to have had much influence on English drama, the plays do attest to a lively interest in theater at the universities and a humanist commitment to classical conceptions of tragedy, comedy, and tragicomedy.
William Gager: The Complete Works
* THE TREND TOWARD increasing the role of CPAs to attest to managements' representations other than in financial statements may continue.
The FDIC Improvement Act: a precedent for expanded CPA reporting?
Further, the act requires a public company's outside auditors to attest to management's assessment of those internal controls.
Audit firms, on the other hand, believe that auditors must attest to the actual internal control environment itself.
Who does what to whom? closing the expectation gap of section 404
The SEC also requested comment on whether it would be desirable to require independent auditors to attest to these assertions, but it did not put the attest requirement in its draft rule.
Respondents also were strongly opposed to a requirement that auditors attest to assertions in the management report.
Reporting on internal control: the SEC's proposed rules; implementation will bring substantial changes in reporting and auditing
CPAs already attest to assertions not included in financial statements, such as assurances to computer software developers that software will perform as advertised; assurances to advertisers that circulation data of newspapers and radio stations are reliable; and assurances to unions that productivity indicators in labor union contracts are credible.
Accountability standards for corporate reporting