God's Punishment of the grave(after death)?

Dont get too much afraid its that a man who is doing wrong atleast he should know it and guilt and respect is the most important thing just be good to humans and then Allah everything is fine there is a beautiful hadith which says you will meet Allah on the day of judgment as you have thought of him if you think he is kareem raheem then why not and there is one other hadith there will be a time in which a man who will say dont do sin in the open he will be a wali ( friend of Allah) so dont worry Allah will guide us and he will show us his mercy .AMEEN