What is the ruling on delaying the prayers from their times and combining them due to work conditions?

Question:
Honorable Shaykh! I work as an employee for the state in the education sector, and I combine the midday and afternoon prayers with the sunset prayer; because classes do not stop during the prayer times. Is the prayer permissible?

Answer:
No, it is not permissible. It is not permissible to combine the midday and afternoon prayers with the sunset prayer. This is not permissible. Combining three prayers is not permissible. It is permissible to combine the midday and afternoon prayers, either by advancing or delaying, in the case of an excuse, if you cannot perform each prayer in its time. It is permissible to combine the midday and afternoon prayers, either by advancing or delaying. As for the sunset prayer, it is not combined with the midday or the afternoon prayer. It is combined with the night prayer, and there is no harm in that. It is combined with the night prayer, either by advancing or delaying.