Praise be to Allah.
There is nothing wrong with accepting payment for teaching Arabic, and there is nothing wrong with accepting it for teaching Qur’aan, and that does not mean that one will not be rewarded for it, if he does the task well and intends thereby to benefit the Muslims and bring them closer to the language of their Prophet and their Qur’aan.
The scholars of the Standing Committee were asked: What is the ruling on accepting payment for teaching young children to memorize Qur’aan? If you say that it is permissible, will the teacher be rewarded by Allaah after taking a monthly salary?
They replied: Learning and teaching the Holy Qur’aan is one of the best means of drawing closer to Allaah, may He be glorified and exalted, if one’s intention is sound. The Prophet (peace and blessings of Allaah be upon him) encouraged learning and teaching Qur’aan as he said: “The best of you is the one who learns the Qur’aan and teaches it.” Accepting payment for teaching Qur’aan does not deprive the Qur’aan teacher of reward from Allaah if his intention is sincere. And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and upon his family and companions.
Fataawa al-Lajnah al-Daa’imah (15/99).
And Allaah knows best.