Giving lessons outside of school in something other than his speciality

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As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
I work as a teacher and I teach more than one subject to people outside of school in areas that are not my speciality although I know them well. Is this halaal or haraam?.
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Praise be to Allaah.

If you know the subject well that you are teaching, and the students know that it is not your specialty, then there is nothing wrong with you teaching them. But if you do not know it well or you give them the impression that this is your speciality, then it is not permissible, because that is deceiving them. The student is looking for a specialized teacher and dealing with him on that basis, so you should tell him the truth so that he will know what is going on, otherwise it is deceiving him. 

Muslim (101) narrated that the Prophet (peace and blessings of Allaah be upon him) said: “The one who deceives us is not one of us.” 

And Allaah knows best.

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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