This is where it all starts, once you’re in your grave and the people have put the soil over you then the final test begins and your results will be given to you then and there. May Allah give us a Husn khatimah (a good end), Ameen.
Prophet Muhammad (Salllahu alayhi wasalaam) said: When a dead person is buried two angels come to him: one of them is called Munkar and the other Nakeer. (Tirmidhi)And know that when death approaches you it will be instant & least expected just like when Munkar & Nakeer, the 2 Angels, whose job to question you in your grave will be.
... And the two Angels will come to him, sit him up and ask him, "Who is your Lord?" He will say, "O, oh! I don't know." They will ask him, "What is your religion?" and he will say "O, oh! I don't know." They will ask him, "What do you say about this man (Prophet Muhammad) who was sent to you?" He will say, "O, oh! I don't know!
Taken from the Work of Shaykh Saalih Al-Fawzaan & Shaykh Abdur Razzaq Al-Abbaad including commentary by Sheikh Saaleh al-Uthaymeen