Nor rebuff the seeker.

There will be a single stern rebuff and lo, they will be observing with their own eyes (all that they had been warned against).

And your Lord has ordained that you do not worship anyone except Him, and treat your parents with kindness if either of them or both reach old age in your presence, do not say Uff to them and do not rebuff them, and speak to them with the utmost respect. ( Any expression of disgust.)