law: Indian Christian Marriage Act,1872 
  51. Solemnization of marriage after
  
  issue of certificate
  After the issue of the
  
  certificate of the Marriage Registrar, or, where notice is required to be given
  
  under this Act to the Marriage Registrars for different districts, after the
  
  issue of the certificates of the Marriage Registrars for such districts,
  
  marriage may, if there be no lawful impediment to the marriage of the parties
  
  described in such certificate or certificates, be solemnized between them,
  
  according to such form and ceremony as they think fit to adopt.
  But every such
  
  marriage shall be solemnized in the presence of some Marriage Registrar (to
  
  whom shall be delivered such certificate or certificates as aforesaid), and of
  
  two or more credible witnesses besides the Marriage Registrar.
  And in some part of
  
  the ceremony each of the parties shall declare as follows, or to the like
  
  effect :-
  "I do solemnly
  
  declare that I know not of any lawful impediment why I, A.B., may not be joined
  
  in matrimony to C. D."
  And each of the
  
  parties shall say to the other as follows or to the like effect :-
  "I call upon
  
  these persons here present to witness that I, A.B., do take thee, C.D., to be
  
  my lawful wedded wife [or husband]."