When the Court has to form an opinion as to—
(i) the usages and tenets of any body of men or family;
(ii) the constitution and governance of any religious or charitable foundation; or
(iii) the meaning of words or terms used in particular districts or by particular classes of people, the opinions of persons having special means of knowledge thereon, are relevant facts.
https://www.leadindia.law/bsa-section-43-opinion-as-to-usages-tenets-etc-when-relevant