Section 123(1)(a) in The Delhi School Education Rules, 1973
(a)No teacher shall:-(i)knowingly or wilfully neglect his duties;(ii)propagate through his teaching lessons or otherwise, communal or sectarian outlook, or incite or allow any student to indulge in communal or sectarian activity;(iii)discriminate against any student on the ground of caste, creed, language, place of origin, social and cultural background or any of them;(iv)indulge in, or encourage, any form of malpractice connected with examination or any other school activity;(v)make any sustained neglect in correcting class-work or homework done by students;(vi)while being present in the school, absent himself (except with the previous permission of the head of the school) from the class which is required to attend;(vii)remain absent from the school without leave or without the previous permission of the head of the school: