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:

Convention on the Elimination of All Forms of Discrimination Against Women

International Covenant on Civil and Political Rights