Marriage ceremony fraudulently gone through without lawful marriage.

Whoever, dishonestly or with a fraudulent intention, goes through the ceremony of being married, knowing that he is not thereby lawfully married, shall be punished with imprisonment of either description for a term which may extend to seven years, and shall also be liable to fine.

Section 82 of the Bharatiya Nyaya Sanhita  

Section 84 of the Bharatiya Nyaya Sanhita