The phrase "affidavit by" is grammatically correct and can be used in written English.
It is commonly used in legal documents, particularly in court proceedings, when referring to an affidavit that has been written and signed by a certain individual. Example: The judge asked the witness to present an affidavit by the victim as evidence in the case.
In response to government criticism of his letter, Karroubi published an affidavit by a male victim of jail rape.
They offered an affidavit by the director of the Defense Intelligence Agency, Vice Adm. Lowell E. Jacoby.
Each of the amendments to Mrs. Astor's will contains a signed affidavit by the supervising lawyer attesting to her competency.
The insurance companies have requested such documents, but few have been produced, according to the affidavit by Mr. Wilson.
The prosecution's case had rested on an affidavit by the C.I.A.'s third-ranking official denying that Mr. Wilson had been working for the agency at the time.
She had learned that "an explosive device can be assembled if separate individuals carry the components," an affidavit by an F.B.I. agent who questioned her said.
The Los Angeles Times report listed five names it said a reporter had seen when shown the unredacted affidavit by "a source with authorized access" to the affidavit.
It was an unusual move to seal the the appellate papers, which included the affidavit by Officer F, and no explanation was given for the decision.
"He feels strongly that he wants his fiction and his characters to remain intact as he wrote them," according to an affidavit by his literary agent.
He provided a copy of the affidavit by Mr. Mohamed, filed in connection to a pending legal action that began before his release.
The man known to the Russians as "B" appears, in the affidavit, by turns grandiose and ingratiating, peevish and obsessively fearful.
