Almighty Allah commanded
“O people of the Scripture (Jews and Christians)! Do not exceed the limits in you religion, nor say of Allah aught but the truth. The Messiah Jesus, son of Mary, was (no more than ) a Messenger of Allah and His Word, (“Be” – and he was) which He bestowed on Mary and a spirit (Ruh) created by Him;
so believe in Allah and His Messengers. Say not: “Three (trinity)!”Cease! (It is ) better for you. For Allah is the only One Ilah (God), Glory be to Him (Far Exalted is He) above having a son. To Him belongs all that is in the heavens and all that is in the earth. And Allah is All Sufficient as a Disposer of affairs.* * *
The Messiah will never be proud to reject to be a slave to Allah, nor the angels who are near (to Allah). And whosoever rejects His worship and is proud, then He will gather them all together unto Himself. So, as for those who believed (in the Oneness of Allah – Islamic Monotheism) and did deeds of righteousness, He will give their (due) rewards, and more out of His Bounty. But as for those who refuse His worship and were proud, He will punish them with a painful torment. And they will not find for themselves besides Allah any protector or helper. (Ch 4:171-173 Quran)
Allah Disclaims Ezra as a Son
Almighty Allah also declared:
”And the Jews say: Ezra is the son of Allah, and the Christians say: Messiah is the son of Allah. That is a saying from their mouths. They imitate the saying of the disbeliveers of old. Allah’s Curse be on them, how they are deluded away from the truth! They (Jews and Christians) took their rabbis and their monks to be their lords besides Allah, (by obeying them in things which they made lawful or unlawful according to their own desires without being ordered by Allah) and (they also took as their lord) Messiah, son of Mary , while they (Jews and Christians) were commanded (in the Torah and the Gospel) to worship none but One Ilah (God- Allah) La ilaha illa Huwa (none has the right to be worshipped but He). Praise and glory be to Him, (far above is He) from having the partners they associate (with Him).” (Ch 9:30-32 Quran)
Allah Disclaims Begetting Anyone
Allah the Almighty also revealed:
“Now ask them (O Muhammad): “Are there (only) daughters for your Lord and sons for them?” Or did We create the angels females while they were witnesses? Verily, it is of their falsehood that they (Quraish pagans) say: “Allah has begotten off-spring or children (angels are the daughters of Allah)” And, verily, they are liars! Has He (then) chosen daughters rather than sons? What is the matter with you? How do you decide? Will you not then remember? Or is there for you a plain authority? Then bring your Book if you are truthful! And they have invented a kinship between Him and the jinns, but the jinn know well that they have indeed to appear (before Him) (i.e. they will be brought for accounts). Glorified be Allah! (He is free) from what they attribute unto Him! Except the slaves of Allah, whom He chooses (for His Mercy i.e. true believers of Islamic Monotheism who do not attribute false things unto Allah).” (Ch 37:149-160 Quran)
And Almighty Allah declared:
“Surely, in disbelief are they who say that Allah is the Messiah, son of Mary. Say (O Muhammad): “Who then has the least power against Allah, if He were destroy the Messiah, son of Mary, his mother, and all those who are on the earth together?” And to Allah belongs the dominion of the heavens and the earth, and all that is between them. He creates what He wills. And Allah is Able to do all things. And (both) the Jews and Christians say; “We are the children of Allah and His loved ones.” Say:
“Why then does He punish you for your sins?” Nay, you are but human beings, of those He has created, He forgive whom He wills and He punishes whom He wills.
And to Allah belongs the dominion of the heavens and the earth and all that is between them, and to Him is the return of all. O people of the Scripture (Jews and Christians)! Now has come to you Our Messenger (Muhammad) making (things) clear unto you, after a break in (the series of ) Messengers, lest you say: “there came unto us no bringer of glad tidings and no warner.” But now has come unto you a bringer of glad tidings and a warner. And Allah is Able to do all things.” (Ch 5:17-19 Quran)
Allah the Exalted warned:
”Surely they have disbelieved who say: “Allah is the Messiah (Jesus), son of Mary.” But the Messiah (Jesus) said: “O Children of Israel! Worship Allah, my Lord and your Lord.” Verily, whosoever sets up partners in worship with Allah, then Allah has forbidden Paradise for him, and the Fire will be his abode. And for the Zalimun (polytheists, and wrong-doers) there are no helpers.
Surely, disbeliveers are those who said: “Allah is the third of the three (in a Trinity).” But there is no Ilah (god) (none who has the right to be worshipped) but One Ilah (God- Allah). And if they cease not from what they say, verily, a painful torment will befall the disbeliveers among them.
Will they not repent to Allah and ask His Forgiveness? For Allah is Oft-Forgiving, Most Merciful. The Messiah (Jesus), son of Mary, was no more than a Messenger; many were the Messengers that passed away before him. His mother (Mary) was a Siddiqah (she believed in the Words of Allah, and His Books. They both used to eat food, as any other human being, while Allah does not eat). Look how We made the Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) clear to them, yet look how they are deluded away from the truth.” (Ch 5:72-75 Quran)
And Almighty Allah ordered: And say:
“All the praises and thanks be to Allah, Who has not begotten a son (nor an offspring), and Who has no partner in His Dominion, nor He is low to have a Wali (helper, protector, or supporter). And magnify Him with all the magnificence, (Allahu-Akbar, Allah is the Most Great).” (Ch 17:111 Quran)
The pagans once asked the Prophet Muhammad (pbuh): “To whom is your Lord related, His original ancestors and His various branches of descendants?” It is also reported that the Jews said: “We worship Ezra, the Son of Allah,” and the Christians said: “Jesus is the Son of Allah,” and the Magians said: “We worship the sun and the moon,” an the Pagans said: “We worship idols.” In response to all of them Allah revealed some of His attributes: Unity, Uniqueness, and other substantives:
”Say: (O Muhammad): “He is Allah, the One. Allah As-Samad (The Self- Sufficient Master, Whom all creatures need, He neither eats nor drinks). He begets not, nor was He begotten; and there is none co-equal or comparable unto Him.” (Ch 112:1-4 Quran)