2 U.S. Code § 4701
2 U.S. Code § 4701 is about Subletting duties of employees of Senate or House. It is under Subchapter I (General) of Chapter 47 (Congressional Ethics) of Title 2 (The Congress) of the Code.
No employee of Congress, either in the Senate or House, shall sublet to, or hire, another to do or perform any part of the duties or work attached to the position to which he was appointed.