An affidavit is more than just a legal document; it's a sworn statement that holds significant weight in the eyes of the law. An affidavit is a sworn statement of fact that can be used in a variety of legal proceedings, from bankruptcy cases to family and civil litigation matters.An affidavit is a type of verified statement or showing, or containing a verification, meaning it is made under oath on penalty of perjury. These additional financial sponsors also have to submit an Affidavit of Support, proof of their income, and proof of their legal status in the United States. USCIS.gov now has an online dictionary (glossary). You can use this dictionary to quickly look up a definition or explanation for a topic. The "Affidavit of Support" is a signed document to accept financial responsibility for a family member who is seeking a green card. An affidavit is a document in which a person gives facts, and swears that the facts are true and accurate. Following a guilty plea or guilty verdict in the superior or district court, the. Commonwealth will move for sentencing.