One angel cannot perform two duties at a time, nor are two angels sent — Angels

"And these are the names of the holy angels who watch. Uriel, one of the holy angels, who is 3 over the world and over Tartarus. Raphael, one of the holy angels, who is over the spirits of men. Raguel, one of the holy angels who takes vengeance on the world of the luminaries. Michael, one of the holy angels, to wit, he that is set over the best part of mankind and over chaos. Saraqael, one of the holy angels, who is set over the spirits, who sin in the spirit. Gabriel, one of the holy angels, who is over Paradise and the serpents and the Cherubim. Remiel, one of the holy angels, whom God set over those who rise."

"Through the dim and lonely forest Comes a low sweet sound, Like the whispering of angels To the greenwood round, Bearing through the hours of midnight, On their viewless wings, Music in its measure telling High and holy things."

"They swear their strongest oaths by Allah, that if a (special) sign came to them, by it they would believe. Say: "Certainly (all) signs are in the power of Allah: but what will make you (Muslims) realise that (even) if (special) signs came, they will not believe"? We (too) shall turn to (confusion) their hearts and their eyes, even as they refused to believe in this in the first instance: We shall leave them in their trespasses, to wander in distraction. Even if We did send unto them angels, and the dead did speak unto them, and We gathered together all things before their very eyes, they are not the ones to believe, unless it is in Allahs plan. But most of them ignore (the truth). Likewise did We make for every Messenger an enemy,- evil ones among men and jinns, inspiring each other with flowery discourses by way of deception. If thy Lord had so planned, they would not have done it: so leave them and their inventions alone. To such (deceit) let the hearts of those incline, who have no faith in the hereafter: let them delight in it, and let them earn from it what they may."

"Or did We create the angels females, while they witnessed? Now surely it is of their own lie that they say: Allah has begotten. And truly they are liars."

"Not all angels play the harp, Or sing in heaven’s choir. Some of them are warriors Who fly on wings of fire."

"And because the king saw a watcher, a holy one, coming down from heaven and saying, ‘Chop down the tree and destroy it, but leave the stump of its roots in the earth, bound with a band of iron and bronze, in the tender grass of the field, and let him be wet with the dew of heaven, and let his portion be with the beasts of the field, till seven periods of time pass over him,’ this is the interpretation, O king: It is a decree of the Most High, which has come upon my lord the king, that you shall be driven from among men, and your dwelling shall be with the beasts of the field. You shall be made to eat grass like an ox, and you shall be wet with the dew of heaven, and seven periods of time shall pass over you, till you know that the Most High rules the kingdom of men and gives it to whom he will."