Article 3, Section 1
Short Version
This is a summary of this section of the U.S. Constitution:
The U.S. Supreme Court is the highest federal court. Congress can create other federal courts. Federal judges can stay in office as long as they follow the law, and their salaries cannot be cut while they are serving.
Long Version
This is the text of the actual U.S. Constitution:
"The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish. The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour, and shall, at stated Times, receive for their Services, a Compensation, which shall not be diminished during their Continuance in Office."

