"Resolved, That the flag of the ∥thirteen∥ United States be thirteen stripes, alternate red and white: that the union be thirteen stars, white in a blue field, representing a new constellation"
June 14, 1777, page 466, in Journals of the Continental Congress. A Century of Lawmaking for a New Nation: U.S. Congressional Documents and Debates, 1774-1875
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You can read about the history of Flag Day and a little bit of history about the American flag in the Library of Congress' "Today in History" entry for June 14.
Our Etiquette and Protocol page links to guides and several statutes about the proper use and display of flags.