Section 12 in The Government of National Capital Territory of Delhi Act, 1991
Title: Oath or affirmation by members
Every member of the Legislative Assembly shall, before taking his seat, make and subscribe before the Lieutenant Governor, or some person appointed in that behalf by him, an oath or affirmation according to the form set out for the purpose in the Schedule.
Title: Voting in Assembly, power of Assembly to act notwithstanding vacancies and quorum
(1) Save as otherwise provided in this Act, all questions at any sitting of the Legislative Assembly shall be determined by a majority of votes of the members present and voting other than the Speaker or person acting as such.
(2) The Speaker or person acting as such shall not vote in the first instance, but shall have and exercise a casting vote in the case of an equality of votes.
(3) The Legislative Assembly shall have power to act notwithstanding any vacancy in the membership thereof, and any proceedings in the Legislative Assembly shall be valid notwithstanding that it is discovered subsequently that some person who was not entitled so to do, sat or voted or otherwise took part in the proceedings.
(4) The quorum to constitute a meeting of the Legislative Assembly shall be one-third of the total number of members of the Assembly.
(5) If at any time during a meeting of the Legislative Assembly there is no quorum, it shall be the duty of the Speaker, or person acting as such, either to adjourn the Assembly or to suspend the meeting until there is a quorum.
Title: Vacation of seats
(1) No person shall be a member both of Parliament and of the Legislative Assembly and if a person is chosen a member both of Parliament and of such Assembly, then, at the expiration of such period as is specified in or under the Representation of the People Act, 1951 (43 of 1951) and the rules made by the President under clause (2) of article 101 and clause (2) of article 190, that persons seat in Parliament shall become vacant, unless he has previously resigned his seat in the Legislative Assembly.
(2) If a member of the Legislative Assembly—
(a) becomes subject to any disqualification mentioned in section 15 or section 16 for membership of the Assembly, or
(b) resigns his seat by writing under his hand addressed to the Speaker and his resignation is accepted by the Speaker,
his seat shall thereupon become vacant:
Provided that in the case of any resignation referred to in clause (b), if from the information received or otherwise and after making such inquiry as he thinks fit, the Speaker is satisfied that such resignation is not voluntary or genuine, he shall not accept such resignation.
(3) If for a period of sixty days a member of the Legislative Assembly is without permission of the Assembly absent from all meetings thereof, the Assembly may declare his seat vacant:
Provided that in computing the said period of sixty days, no account shall be taken of any period during which the Assembly is prorogued or is adjourned for more than four consecutive days
Title: Disqualifications for membership
(1) A person shall be disqualified for being chosen as, and for being, a member of the Legislative Assembly—
(a) if he holds any office of profit under the Government of India or the Government of any State or the Government of any Union territory other than an office declared by law made by Parliament or by the Legislature of any State or by the Legislative Assembly of the Capital or of any other Union territory not to disqualify its holder; or
(b) if he is for the time being disqualified for being chosen as, and for being, a member of either House of Parliament under the provisions of sub-clause (b), sub-clause (c) or sub-clause (d) of clause (1) of article 102 or of any law made in pursuance of that article.
(2) For the purposes of this section, a person shall not be deemed to hold an office of profit under the Government of India or the Government of any State or the Government of any Union territory by reason only that he is a Minister either for the Union or for such State or Union territory
(3) If any question arises as to whether a member of the Legislative Assembly has become disqualified for being such a member under the provisions of sub-section (1), the question shall be referred for the decision of the President and his decision shall be final.
(4) Before giving any decision on any such question, the President shall obtain the opinion of the Election Commission and shall act according to such opinion.
Title: Disqualification on ground of defection
The provisions of the Tenth Schedule to the Constitution shall, subject to the necessary modifications (including modifications for construing references therein to the Legislative Assembly of a State, article 188, article 194 and article 212 as references, respectively, to the Legislative Assembly, section 12, section 18 and section 37 of this Act), apply to and in relation to the members of the Legislative Assembly as they apply to and in relation to the members of the Legislative Assembly of a State, and accordingly:—
(a) the said Tenth Schedule as so modified shall be deemed to form part of this Act; and
(b) a person shall be disqualified for being a member of the Legislative Assembly if he is so disqualified under the said Tenth Schedule as so modified.