What happens when the angels come to take away the lives of unbelievers (wrongdoers) during the time of their deaths? 

 

Verse 93 of Chapter 6

And who can be more unjust than he who invents a lie against Allah, or says: "I have received inspiration,'' whereas he is not inspired in anything; and who says, "I will reveal the like of what Allah has revealed.'' And if you could but see when the wrongdoers are in the agonies of death, while the angels are stretching forth their hands (saying): "Deliver your souls! This day you shall be recompensed with the torment of degradation because of what you used to utter against Allah other than the truth. And you used to reject His Ayat with disrespect!''

 Verses 49-51 of Chapter 8

When the hypocrites and those in whose hearts was a disease (of disbelief) said: "These people (Muslims) are deceived by their religion.'' But whoever puts his trust in Allah, then surely, Allah is All-Mighty, All-Wise. And if you could see when the angels take away the souls of those who disbelieve (at death); they smite their faces and their backs, (saying): "Taste the punishment of the blazing Fire.'' "This is because of that which your hands forwarded. And verily, Allah is not unjust to His servants.''

Verses 27-28 of Chapter 47
Then how (will it be) when the angels will take their souls at death, striking their faces and their backs. That is because they followed that which angered Allah and hated what earns His pleasure, so He rendered their deeds worthless.