And they said : Most Gracious has begotten a son!

They say: "(Allah) Most Gracious has begotten a son!"
[89] Indeed ye have put forth a thing most monstrous!
[90] As if the skies are ready to burst, the earth to split asunder, and the mountains to fall down in utter ruin.
[91] That they should invoke a son for (Allah) Most Gracious.
[92] For it is not consonant with the majesty of (Allah) Most Gracious that He should beget a son
[93] Not one of the beings in the heavens and the earth but must come to (Allah) Most Gracious as a servant. Quran 19.88..93 ( Surat Maryam , verses 88 .. 93)

They say: "Allah hath begotten a son": Glory be to Him, nay, to Him belongs all that is in the heavens and on earth: everything renders worship to Him. Quran 2.116 ( Surat albakarah , verse 116)

They say, "Allah hath begotten a son!" Glory be to Him! He is Self-Sufficient! His are all things in the heavens and on earth! No warrant have ye for this! Say ye about Allah what ye know not? Quran 10.68 ( Surat Yunus , verse 68)

Further, that He may warn those (also) who say, "Allah hath begotten a son":[5] No knowledge have they of such a thing, nor had their fathers. It is a grievous thing that issues from their mouths as a saying: What they say is nothing but falsehood! Quran 18.4,5 ( Surat Al-Kahf , verses 4,5)

To Him is due the primal origin of the heavens and the earth: how can He have a son when He hath no consort? He created all things, and He hath full knowledge of all things.Quran 6.101 ( Surat  Al-Anam , Verse 101)

It is not befitting to (the majesty of) Allah that He should beget a son. Glory be to Him! when He determines a matter, He only says to it, "Be," and it is. Quran 19.35( Surat Maryam , verse 35)

And they say: "(Allah) Most Gracious has begotten offspring." Glory to Him! They are (but) servants raised to honour.
[27] They speak not before He speaks, and they act (in all things) by His command.
[28] He knows what is before them, and what is behind them, and they offer no intercession except for those who are acceptable, and they stand in awe and reverence of His (glory).
[29] If any of them should say, "I am a god besides Him," such a one We should reward with Hell: thus do We reward those who do wrong.  Quran 21.26,29 ( Surat alanbya , verses 26..29)

The Jews call 'Uzair a son of Allah, and the Christians call Al-Masih the son of Allah. That is a saying from their mouth; (in this) they but imitate what the Unbelievers of old used to say. Allah's curse be on them: how they are deluded away from the Truth!
[31] They take their priests and their anchorites to be their lords in derogation of Allah, and (they take as their Lord) Al-Masih, the son of Maryam; yet they were commanded to worship but One God: there is no god but He. Praise and glory to Him: (far is He) from having the partners they associate (with Him).
 [32] Fain would they extinguish Allah's Light with their mouths, but Allah will not allow but that His Light should be perfected, even though the Unbelievers may detest (it).
[33] It is He Who hath sent His Messenger with Guidance and the Religion of Truth, to proclaim it over all religion, even though the Pagans may detest (it).
[34] O ye who believe! There are indeed many among the priests and anchorites, who in falsehood devour the substance of men and hinder (them) from the Way of Allah. And there are those who bury gold and silver and spend it not in the Way of Allah: announce unto them a most grievous penalty. Quran 9.32,34 ( Surat  At-Touba , Verses 32..34)