I am a teacher, and on the first days of term we have no work and we want to leave early, 3 hours before the end of the working day, and the administration allows that.


Praise be to Allaah.

If there is
no work and the administration allows the teachers to leave, then there is
no sin on you if you leave, because the administration is authorized to
decide what is in the best interests of the work and to divide tasks among
employees. 

Shaykh Ibn
Baaz (may Allaah have mercy on him) was asked about an employee who, when he
has finished his work, leaves before working hours are over, especially
during Ramadaan. Is that permissible? 

He replied:
It is not permissible, and he has to stay at work until the working hours
are over, unless he has permission from his boss, because some new work may
come up, and he may be needed. So the employee should stay at work until the
working hours are over, unless he has permission from the state or from his
boss. End quote from Fataawa Noor ‘ala al-Darb

And Allaah
knows best.