PART XII – Miscellaneous
Chapter 5. Interpretation
Article 260(3)

2603In the Constitution and all enactments and other legal instruments, unless there is anything repugnant in the subject or context
a“Muslim” means a person who believes in the unity and oneness of Almighty Allah, in the absolute and unqualified finality of the Prophethood of Muhammad (peace be upon him), the last of the prophets, and does not believe in, or recognize as a prophet or religious reformer, any person who claimed or claims to be a prophet, in any sense of the word or of any description whatsoever, after Muhammad (peace be upon him); and
b“non-Muslim” means a person who is not a Muslim and includes a person belonging to the Christian, Hindu, Sikh, Buddhist or Parsi community, a person of the Quadiani Group or the Lahori Group who call themselves ‘Ahmadis’ or by any other name or a Bahai, and a person belonging to any of the Scheduled Castes.