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affidavit (n.)

"written declaration upon an oath," 1590s, from Medieval Latin affidavit, literally "he has stated on oath," third person singular perfective of affidare "to trust; to make an oath," from Latin ad "to" (see ad-) + fidare "to trust," from fidus "faithful," from PIE root *bheidh- "to trust, confide, persuade." So called from being the first word of sworn statements.

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Definitions of affidavit from WordNet

affidavit (n.)
written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath;
From wordnet.princeton.edu