Act of Congress
"All Acts of Congress" are required to have an "enacting clause" that states: "Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled." 1 U.S.C. 101.
Acts of Congress are published in the United States Statutes at Large in the order in which they were enacted by each session of Congress and the Statutes at Large thus constitutes "legal evidence of laws." 1 U.S.C. 112.