It is reported that Mujâhid – Allâh have mercy on him – said, “The teacher of the kuttâb (where the children would be taught, the madrasah) will be brought on the Day of Resurrection, and if he was not fair and just with the boys, he will be grouped with the tyrants.”

Abû Bakr Al-Daynûrî, Al-Mujâlasah wa Jawâhir Al-‘Ilm article 619.