The Family Of Imran - 3:106
"On that Day some faces will be justified and some faces will be darkened. Those whose faces will be darkened will be told: "Did you disbelieve after you believed? Taste the torment for your disbelief."
The disbelievers of the People of the Book used to mislead the believers by attempting to change the way of Allah, so the believers are warned about it:
The Family Of Imran/3:100
Believers! If you follow some of the people of the Book, they will turn you back to disbelief after you have believed.
The Family Of Imran/3:101
How can you disbelieve when the verses of Allah are recited to you and His messenger is among you? Whoever clings to Allah is guided to the straight path.
The Women/4:44
Do you not see that those who have been given a share of the Book have bought error and wish that you should go astray?
The Women/4:45
Allah knows your enemies better. Allah is sufficient as a friend and owner, and Allah is sufficient as a helper.
The Family Of Imran/3:65
O people of the Book, why do you dispute about Abraham, when the Injeel and the Torah were sent down after him? Do you not use your intellect?
The Family Of Imran/3:66
You argue about matters about which you have knowledge! But how can you argue about something about which you have no knowledge? You may not know, but Allah knows.
The Family Of Imran/3:67
Abraham was neither a Jew nor a Christian; he was a monotheistic Muslim. He was never of those who associate partners.
The Family Of Imran/3:68
The closest of mankind to Abraham are those who follow him, this prophet and those who believe. Allah is the sovereign and the friend of the believers.
The Family Of Imran/3:69
A group of the people of the Book want to lead you astray. They only mislead themselves. They do not even realize it.
The Family Of Imran/3:70
People of the Book! Why do you deny the Verses of Allah while you are witnesses?
The Family Of Imran/3:71
People of the Book! Why do you confuse right and wrong and knowingly conceal the truth?
The Family Of Imran/3:72
"A group of the people of the Book said: "Believe in what has been sent down to the believers at the beginning of the day and disbelieve at the end. So that perhaps they may turn away from their religion."
The Women/4:88
Why do you divide yourselves into two groups about the hypocrites? Allah has turned them upside down because of what they used to do. Do you want to guide those whom Allah has led astray? You will find no way for him whom Allah has led astray.
The Women/4:89
They wanted you to disbelieve as they disbelieved so that you might become one with them. Do not take any of them as friends until they take action in the way of Allah. If they turn against you, seize them and kill them wherever you find them. Take them neither as friends nor as helpers;
The Table Spread/5:57
Believers, do not make friends among the people of the Book before you and among the disbelievers those who make your religion a mockery and amusement. You should listen to Allah if you are believers.
The Table Spread/5:58
When you called them to prayer, they mocked and amused themselves with it. They are a people who do not think.
The Women/4:51
"Do you not see those who have been given a share of the Book? They believe in idolatry and false doctrines, and say of those who disbelieve, "These are more rightly guided than those who believe"."
The Women/4:60
Do you not see those who claim to believe in you and in what has been sent down to you and in what has been sent down before you, but they want to follow the laws of the unjust and despotic, while they were commanded to disbelieve in it, but Satan wants to lead them astray.
The Pleading Woman/58:14
Have you not noticed those who take as friends a people against whom Allah is angry? They are neither of you nor of them. They knowingly swear falsely!
The Woman Who Is Examined/60:1
O you who believe, do not take my enemy as a friend and your enemy as a friend. You show them love while they have denied the truth that has come to you and have driven out the messenger and you (from your country) because you believed in Allah, your Lord. How can you love them secretly if you have gone out on a jihad in My way to win My favor? But I know very well what you conceal and what you reveal. Whoever of you does so has gone astray from the right path.
The Cow/2:135
"They said: "Become Jews or Christians so that you may be guided". Say: "No, we follow the monotheistic religion of Abraham. He was not of those who associate partners."
The Cow/2:140
"Do you claim that Abraham, Ishmael, Isaac, Jacob and their descendants were Jews or Christians? Say: "Do you know better or Allah? Who is more unjust than he who conceals what Allah has revealed? Allah is not heedless of what you do."
The Family Of Imran/3:78
"Some of them try to make what is not in the Book resemble the Book by twisting their tongues so that you may think that what is not in the Book is in the Book, and they say, "This is from Allah"when it is not from Allah. They knowingly lie in the name of Allah."