A daa’iyah is going to leave his city even though the people need him
Question

                There is a man who acts as the imam of a mosque where he holds lessons and gives talks. The people of that neighbourhood need him, but he wants to leave the mosque because of his living situation. Is there any sin on him?.
Praise be to Allah.
    It is as if you are saying that there is no one in the 
    neighbourhood who can take the place of this man, and the people need him. 
    So his teaching this group of people is an individual obligation (fard ‘ayn) 
    for him. If he moves, we think that: 

    If he is in the same city, then he can come to the mosque 
    where he was previously, even if it is on the other side of the city. 

    If he moves to another city, then if it is for an essential 
    reason, there is no sin on him, such as if he travels to earn a living and 
    he does not have enough to live on. In such a case there is no sin on him, 
    and the community has to look for another person to take his place, or they 
    should support this man so that he will be free to teach them.