This article provides a comprehensive sample of an affidavit letter, guiding readers through the essential components and format. For completed examples of some legal forms, see our Self Help Form and Sample Packets page.Handwritten forms are hard to read. I am competent to testify as to the matters set forth herein and if called as a witness would testify as set forth below. I am providing this affidavit to verify my income as I have no other income documentation available to me. CitizenPath has prepared a downloadable I751 affidavit sample that you can forward to friends who are willing to write a letter of support. Daniel Matsunaga confirms in an affidavit that his legal beneficiaries are his wife Rosario Matsunaga and son Jose Matsunaga.