Surah AL-Ikhlas ( The sincerity)
In the name of Allah the merciful, the compassionate :
"Say: he is allah the one and unique(god); Allah who is in need of none and of whom all are in need; He neither begot any nor was he begotten; and none is comparable to him."

Surat An-Nisā' (The Women)
In the name of Allah the merciful, the compassionate :
O People of the Scripture, do not commit excess in your religion or say about Allah except the truth. The Messiah, Jesus, the son of Mary, was but a messenger of Allah and His word which He directed to Mary and a soul [created at a command] from Him. So believe in Allah and His messengers. And do not say, "Three"; desist - it is better for you. Indeed, Allah is but one God. Exalted is He above having a son. To Him belongs whatever is in the heavens and whatever is on the earth. And sufficient is Allah as Disposer of affairs.

Islam is the only true monotheism, other religions came with the same message as islam but were falsified. Allah is One and Eternal, He is beyond the bounds of time and space. He created the universe and humans and he will one day end it to create another one, to judge humans for their acts.

Sorah Al-Anbiya (The Prophets) 104:
In the name of Allah the merciful, the compassionate :
"The Day when We will fold the heaven like the folding of a [written] sheet for the records. As We began the first creation, We will repeat it. [That is] a promise binding upon Us. Indeed, We will do it."

I will let you guess what this verse is refering to..