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An affidavit is a signed, written statement of facts stated to be within the personal knowledge of the person making the statement (the affiant or deponent) that includes a verification—which is a statement that the affiant is swearing to the truth of the statement or making the statement under penalty of perjury—meaning the affiant can be prosecuted for the crime of perjury if they make the statement knowing it is false. An affidavit is also sometimes referred to as a verified statement or a sworn statement.

An affidavit is said to be “made under oath or affirmation.” Traditionally, affidavits were made with a sworn promise or oath before God or a supreme being that the statement was truthful—“the truth, the whole truth, and nothing but the truth, so help me God.” Affidavits are now also made on the alternative basis of an affirmation in which the affiant affirms the truth of the facts under penalty of perjury.

When the affiant signs the statement of facts in the affidavit—after making a spoken oath or affirmation to the notary public (person who administers the oath or affirmation)—the language above the affiant’s signature in which the affiant swears to or affirms the truthfulness of the preceding or foregoing statement is sometimes known as a Verification Upon Oath or Affirmation.

An affidavit must also be notarized—signed by a licensed notary public (notary) and stamped with the notary’s official stamp or seal—which sometimes includes a statement that the named person (affiant) appeared before the notary; the notary confirmed the identity of the affiant; the affiant swore under oath or penalty of perjury (affirmation) that the facts stated in the affidavit are within the affiant’s personal knowledge and are true and correct; and the affiant signed the document in the presence of the notary on the date indicated. This recitation of the making of the affidavit is sometimes called the preamble.

With or without a preamble statement, the notary public must certify that the notary administered an oath or affirmation to the affiant and the affiant signed the affidavit in the presence of the notary. This certification is known a jurat and often includes the words “Sworn to and subscribed before me, the undersigned notary public, by __________(affiant) on this ___ (date) day of ______(month), _______(year).”

Because an affidavit is a sworn statement made under oath or penalty of perjury it is accepted as evidence of the facts stated in many legal contexts, including in some court proceedings.

In Texas, an affidavit is a written statement of facts that the affiant (the person making the statement) declares to be true within their personal knowledge. The affiant must sign the affidavit under oath or affirmation, which is a solemn declaration of truthfulness under penalty of perjury. This means that if the affiant knowingly makes a false statement, they can be prosecuted for perjury. Affidavits can be made traditionally under oath, invoking a deity, or through affirmation, which does not involve religious references. The affidavit must be notarized, which involves a licensed notary public who confirms the identity of the affiant, witnesses the signing of the document, and ensures that the affiant understands they are swearing to or affirming the truth of the statements under penalty of perjury. The notary public then completes a jurat, which is a certification that includes the date and the statement that the affiant has sworn to or affirmed the contents of the affidavit in the notary's presence. Affidavits are commonly used in various legal contexts in Texas as evidence because they are sworn statements.

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