What is the ruling on the supplication of the oppressed against the one who oppressed him?

Question:
I am complaining about the oppression of some of those who have taught me up to now, and whenever I mention him, I supplicate against him morning and evening. What is the ruling on this? May Allah reward you with the best reward.

Answer:
If he intentionally oppressed you, there is no doubt that he deserves to be supplicated against. However, leaving off the supplication is better. If you do not supplicate against him, it is better and more severe for him in his sin if he oppressed you; for example, if he taught you what Allah has forbidden intentionally, knowing it, or if he prevented you from your right in education, not teaching you while he is able to, or if it is not the teaching of a teacher, or if he taught you contrary to the truth intentionally, wanting to mislead you and cause you to go astray.
As for if he made a mistake, it is not permissible for you to supplicate against him. If a person makes a mistake, the teacher may be ignorant, or the teacher may make a mistake. But if you know that he intended harm for you, and he was explicit with you about the harm, and that he wants to mislead you, and wants to take you out of the light into the darkness—harming you—if he transgressed against you; if you supplicate against him, there is no harm. Allah the Exalted and Majestic says: [Al-Nisa: 148], but if you do not supplicate against him and you say, "Sufficient for us is Allah, and He is the best Disposer of affairs," that is better than the supplication.