"The Spirit of the Laws". Treatise by Charles de Secondat, Baron de Montesquieu, Book XXIX: Of the Manner of Composing Laws, Ch. 16: Things to be Observed in the Composing of Laws, 1748.
"Novanglus Papers" no. 7 (1774). Almost certainly derived from James Harrington, but Adams's use of the phrase gave it wide circulation in the United States. He also used "government of laws, and not of men" in the Declaration of Rights drafted for the Massachusetts Constitution in 1780. See Cox 1; Gerald Ford 3; James Harrington 1
Charles Lamb (1848). “Final Memorials of Charl. Lamb; Consisting Chiefly of His Letters Not Before Published, with Sketches of Some of His Companions: By Thom. Noon Talfourd”, p.108