From Abu Hurayrah, who said: "The Messenger of Allah said: ‘When the deceased is buried (or he said: when one of you is buried), there come to him two blue-black angels, one of whom is called Munkar and the other Nakeer. They ask him, ‘What did you used to say about this man?’ and he says what he used to say: ‘He is the slave and Messenger of Allah: I bear witness that there is no god except Allah and that Muhammad is the slave and Messenger of Allah. They say, ‘We knew beforehand that you used to say this.’ Then his grave will be widened for him to a size of seventy cubits by seventy cubits and it will be illuminated for him. Then they tell him, ‘Sleep.’

He says, ‘Go back to my family and tell them.’ They tell him, ‘Sleep like a bridegroom whom no-one will wake up except his most beloved,’ until Allah raises him up. If (the deceased) was a hypocrite, he says, ‘I heard the people saying something so I said something similar; I do not know.’ They say: ‘We knew beforehand that you used to say this.’ The earth will be told to squeeze him, so he will be crushed until his ribs are interlocked, and he will remain like that until Allah raises him up.’" (reported by al-Tirmidhi, no. 1071. Abu ‘Isa said: It is a ghareeb hasan hadeeth. It is judged hasan in Saheeh al-Jaami‘, no. 724).
(7) Haaroot and
(8) Maaroot

Allah says (interpretation of the meaning):

". . . and such things as came down at Babylon to the angels Haaroot and Maaroot . . ." [al-Baqarah 2:102]

". . . and none can know the forces of your Lord, except He. And this is no other than a warning to mankind." [al-Muddaththir 74:31]

Their powers
The angels have great powers given to them by Allah, including the following:

The ability to take on different forms. Allah has given the angels the ability to take on forms other than their own. Allah sent Jibreel to Maryam (Mary) in the form of a man, as Allah says:

". . . Then We sent to her Our angel, and he appeared before her as a man in all respects." [Maryam 19:17]

Angels also came to Ibrahim in human form, and he did not know that they were angels until they told him so. Similarly, angels came to Lut in the form of young men with beautiful faces. Jibreel used to come to the Prophet in different forms: sometimes he would appear in the form of Dihyah al-Kalbi, a Sahaabee who was very handsome, and sometimes in the form of a Bedouin. The Sahaabah saw him in his human form, as is reported from ‘Umar ibn al-Khattaab in the two Saheehs. (‘Umar) said:

"One day while we were sitting with the Messenger of Allah , there appeared before us a man whose clothes were exceedingly white and whose hair was exceedingly black; no signs of travel were to be seen on him, and none of us knew him. He walked up and sat down by the Prophet . Resting his knees against his and placing his hands on his thighs, he said: ‘O Muhammad, tell me about Islam.’. . ." >(Saheeh Muslim, no. 8).