Bismillah.
Narrated Al-Bara' bin 'Azib :
The Prophet (p.b.u.h) said, "When a faithful believer is made to sit in his grave, then (the angels) come to him and he testifies that none has the right to be worshipped but Allah and Muhammad is Allah's Apostle. And that corresponds to Allah's statement: Allah will keep firm those who believe with the word that stands firm . . . (14.27).
Narrated Shu'ba:
Same as above and added, "Allah will keep firm those who believe . . . (14.27) was revealed concerning the punishment of the grave."
Here's the background of this ayah. Must read to get the whole picture. Click here.
Who knows how much time we're going to spend in our graves? Tens, hundreds, thousands, millions of years? It'd be nice if we enjoy that time, no? May Allah protect us from the punishment of the grave.
Wassalam.
