Article 1, Section 9, Clause 3
Vermont Constitution of 1786, CH. 2, SEC. 17Thorpe 6:3757
XVII. No person ought, in any case, or in any time, to be declared guilty of treason or felony by the Legislature.
The Founders' Constitution
Volume 3, Article 1, Section 9, Clause 3, Document 7
The University of Chicago Press
Thorpe, Francis Newton, ed. The Federal and State Constitutions, Colonial Charters, and Other Organic Laws of the States, Territories, and Colonies Now or Heretofore Forming the United States of America. 7 vols. Washington, D.C.: Government Printing Office, 1909.
Easy to print version.