25 ILCS 5/2

Every officer of each house of the General Assembly shall, before entering upon the duties of his office, take and subscribe the following oath, which shall be filed with the Secretary of State:     "I do solemnly swear (or affirm, as the case may be,) that I will support the constitution of the United States, and the constitution of the state of Illinois, and that I will faithfully discharge the duties of the office of

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(25 ILCS 5/2) (from Ch. 63, par. 2)
    Sec. 2. Every officer of each house of the General Assembly shall, before entering upon the duties of his office, take and subscribe the following oath, which shall be filed with the Secretary of State:
    "I do solemnly swear (or affirm, as the case may be,) that I will support the constitution of the United States, and the constitution of the state of Illinois, and that I will faithfully discharge the duties of the office of .... according to the best of my ability."
(Source: R.S. 1874, p. 555.)

    
Notes of Decisions
Cited in 5 cases (5 in the last 5 years), 2023–2025 · leading case: Caulkins v. Pritzker
Caulkins v. Pritzker (2023) ill “The same is required for the circuit court judiciary (705 ILCS 35/2 (West 2020)) as well as the appellate and supreme courts and certain members of the executive branch (Ill.”
First Midwest Bank v. Rossi (2023) illappct “Allowing lawmakers to continue to ignore constitutional mandates under the enrolled-bill doctrine, knowing full well the constitutional requirements were not met, belittles the language of the oaths, ignores the need for transparency in government, and undermines the language of…”
Accuracy Firearms, LLC v. Pritzker (2023) illappct “XIII, § 3. Allowing lawmakers to continue to ignore constitutional mandates under the enrolled-bill doctrine, knowing full well the constitutional requirements were not met, belittles the language of the oaths, ignores the need for transparency in government, and undermines the…”
Piasa Armory, LLC v. Raoul (2025) ill “The same is required for the circuit court judiciary (705 ILCS 35/2 - 26 - (West 2020)) as well as the appellate and supreme courts and certain members of the executive branch (Ill. Const. 1970, art.”
Accuracy Firearms, LLC v. Pritzker (2025) illappct “” ’ 25 ILCS 5/2 (West 2020); Ill. Const. 1970, art.”
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