http://www.whitehouse.gov/our-government/the-constitution

Preamble to the Constitution


http://www.senate.gov/civics/constitution_item/constitution.htm

The Preamble explains the purposes of the Constitution, and defines the powers of the new government as originating from the people of the United States.

Preamble:
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

http://www.america.gov/publications/books/the-constitution.html

This illustrated publication includes the complete text of the U.S. Constitution preamble, seven articles, and 27 amendments