The Phrase “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 
    phrase is not correct, because it means that the one who says it is putting 
    his trust in himself first. What he should say is, “I have done my best and 
    I ask Allah for help.” This is what is correct.
Perhaps 
    when a person says “I have done my best and the rest is up to Allah”, what 
    he means is what I have suggested here, i.e., what I could do, I have done, 
    and what I cannot do is up to Allah, But the phrase is basically incorrect. 
    Rather he should say, “I have done my best and I ask Allah for help.” 
    
And 
    Allah knows best.