In the Bible, God says "For God so loved the world, that he gave his only Begotten son"
The words "Begotten" and "Son" are not accurate. View Jesus is the Son of God for more information.
In the Quran, God says:
"They say: (God) Most Gracious has begotten a son! Indeed ye have put forth a thing most monstrous! At it the skies are ready to burst, the earth to split asunder, and the mountains to fall down in utter ruin, That they should invoke a son for (God) Most Gracious. For it is not consonant with the majesty of (God) Most Gracious that He should beget a son." (Quran 19:88-92)