What is the oldest written source in this country that mentions this right?

Libya

Freedom of association is protected under Article 26 of the 1951 Libyan Constitution: “Freedom of peaceful association shall be guaranteed, and the exercise thereof shall be regulated by law. Secret societies and associations that aim to achieve political goals through organizations of a military character are prohibited” (World Constitutions Illustrated).

"Constitution of the Kingdom of Libya of 1951," [Constitution of the Kingdom of Libya of 1951] (1951): 1-26

Freedom of Association · Country sources (all rights) · Last edited 2023-11-13 · Edit on GitHub