Summary of Sunni concepts
The torment and bliss of the grave
It is proven by the Qur’an and Sunnah
The dead person will either rest in his grave
Or he will be tortured, God forbid
This applies to every dead person, whether or not he has been buried
The evidence for the bliss of the grave is from the Qur’an
God Almighty's saying
Those whom angels take to death are good
They say peace be upon you
Enter Paradise for what you did
This is what is said at the time of death
Good news for the believer that he will enjoy in his grave
Until the Hour comes
The evidence of the torment of the grave is the words of God Almighty
They are exposed to the Fire morning and evening
And the day the Hour comes
Enter Pharaoh's family into the most severe torment
As for the Sunnah
There have been many hadiths mentioning the torment and bliss of the grave
Among them is the hadith of supplication after the tashahhud in prayer
Oh God, I seek refuge in You from the torment of the grave
I seek refuge in You from the temptation of the Antichrist
Agreed
Summary of Sunni concepts