Aslam

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.