It befits not (the Majesty of) Allâh that He should beget a son [this refers to the slander of Christians against Allâh, by saying that 'Iesa (Jesus) is the son of Allâh]. Glorified (and Exalted be He above all that they associate with Him). When He decrees a thing, He only says to it, "Be!" and it is.

[Quran 4:171]