The Expression “The Rest is Up to Allah” is Not Correct
Question

                How correct is it to say, “I have done my best and the rest is up to Allah”?
Praise be to Allah.
    This expression is not correct, because it 
    means that the one who does that is relying upon himself first of all. 

    Saying, “I have done my best and I ask Allah for help” is correct. Perhaps 
    when a person says, “I have done my best and the rest is up to Allah,” he 
    means what I have mentioned, i.e., I have done what I can and what I cannot 
    do is up to Allah. But the basis of this expression is wrong, rather he 
    should say, “I have done my best and I ask Allah for help.”.