2 U.S. Code § 4551
2 U.S. Code § 4551 is about Day for paying salaries of the House of Representatives. It is under Part B (Administration) of Subchapter II (House of Representatives) of Chapter 45 (Congressional Pay and Benefits) of Title 2 (The Congress) of the Code.
The usual day for paying salaries in or under the House of Representatives shall be the last day of each month, except that if the last day of a month falls on a Saturday, Sunday, or a legal public holiday, the Chief Administrative Officer of the House of Representatives shall pay such salaries on the first weekday which precedes the last day.