What is the oldest written source in this country that mentions this right?
South Africa
The Constitution of the Republic of South Africa was ratified on December 18, 1996. Articles 9, 15, and 31 grant religious freedom, equality, and prohibit religious discrimination. Government of South Africa . “The Constitution of the Republic of South Africa.” South African Government. Last modified 2003. Accessed July 5, 2022. https://www.gov.za/documents/constitution/constitution-republic-south-africa-1996-1#:~:text=The%20Constitution%20of%20the%20Republic%20of%20South%20Africa%2C%201996%2C%20was,the%20provisions%20of%20the%20Constitution.