United States Constitution:Article I
For the full text of the U.S. Constitution, see Full Text of the United States Constitution.
Article One, section two, discusses the method of election and qualifications necessary to serve in the House, as well as the procedure for calculating the number of representatives each state may elect. These sections also touch on filling vacancies in the house, choosing the speaker of the house, and impeachment.
Article One, section three, discusses the election, qualifications of, and impeachment of senators. It also establishes the Vice President of the United States as the president of the Senate.
Section four elaborates on the "times, places, and manner" of holding elections for Senators and Representatives. It also establishes that the Congress must assemble at least once each year.
Section five establishes the rules of congress.
Section six addresses the compensation and immunities of the senators and representatives. This includes the Ineligibility Clause that prohibits appointment to offices for which the proposed office holder had voted a salary increase.
Section seven states that all bills for raising money must originate in the House of Representatives.
Section eight specifically states the power of Congress. These are called the Enumerated Powers.
Section nine elaborates several restrictions on Congress.
Section ten details restrictions on the states. 
- U.S Government and Politics
- The United States Constitution (see top of page for a link)