See ESC right:

Non-discrimination in exercising of rights

Relevant ICESCR Articles:

02(2): The States Parties to the present Covenant undertake to guarantee that the rights enunciated in the present Covenant will be exercised without discrimination of any kind as to race, colour, sex, language, religion, political or other opinion, national or social origin, property, birth or other status.

Related Documents:

Declaration on Race and Racial Prejudice

Declaration on the Elimination of All Forms of Racial Discrimination

Declaration on the Rights of Persons Belonging to National or Ethnic, Religious or Linguistic Minorities

International Convention on the Elimination of All Forms of Racial Discrimination

International Convention on the Suppression and Punishment of the Crime of Apartheid