The first known assertion of the right to association in Egypt was in the Royal Decree No. 42 of 1923, which established a Constitutional system of government in monarchical Egypt. The right is established in Part II, Article 21 (“Royal Decree No. 42 of 1923”, 1923).

References:

1923. Royal Decree No. 42 of 1923. https://constitutionnet.org/sites/default/files/1923_-_egyptian_constitution_english_1.pdf.