The Cattle - 6:8 "They say, "Should not an angel have been sent down to him!"If We had sent down an angel, the work would have been finished. They would not have been given time."
Angels come in human form to announce the destruction of the community:
The Rocky Tract/15:5 No people will exceed or fall behind its appointed term.
The Rocky Tract/15:6 "They said: "O you who have been sent down the Message, you are a madman."
The Rocky Tract/15:7 Bring us the angels if you are truthful.
The Rocky Tract/15:8 We do not send the angels except for a definite purpose, and then no one is given a deadline.

The Scatterers/51:31 "(Abraham said): "O messengers, what is your mission?"
The Scatterers/51:32 "They said, "We have been sent to a guilty people."
The Scatterers/51:33 To send upon them stones of clay...
The Scatterers/51:34 Marked by your Lord for the transgressors.

The Criterion/25:21 "Those who did not expect to meet Us said: "Either angels should descend on us or we should see our Lord". They were arrogant to themselves and had gone far in rebellion."
The Criterion/25:22 "The day when they see the angels will not be a pleasant day for the guilty. They will say: "We are completely surrounded"."