O Prophet ‘Muhammad’, surely We have revealed to you the Book ‘this Quran’ with the truth, for the instruction of Mankind. So whoever chooses to be guided, it is for their own good. And whoever chooses to astray, it is only to their own loss. You ‘Muhammad’ are not set up as a guardian ‘trustee or disposer of affairs, or keeper’ over them.
Meaning:-
Astray: into error, away from the correct path or direction
disposer: make receptive or willing towards an action or attitude or belief.