Hameed bin Abi Hameed حميد بن أبي حميد الطويل · The Book of Funerals

"O Messenger of Allah, why will the believers be tested in their graves except the martyr?" He said: "The flashing of the swords above his head is trial enough."

"When one of you dies he is shown his place morning and evening. If he is one of the people of paradise them he is one of the people of Paradise, and if he is one of the people of Hell, then he is one of the people of Hell, until Allah, the Mighty and Sublime, raises him up on the Day of Resurrection."