the.com/affidavit

means A written statement of facts that you swear or affirm is true, usually signed before a notary or other authorized official, for use as evidence.

from Straight from Medieval Latin affidavit, meaning 'he/she has sworn' or 'has pledged faith' — the perfect-tense verb form of affidare, built from ad- ('to') plus fidare ('to trust'), itself rooted in fides ('faith, trust'). Latin legal documents often began with the operative verb stating what the signer had just done, so the document literally took its name from its own opening word — 'he has declared on oath.' A cousin of words like 'fidelity' and 'confide,' all trailing back to that same root of trust.