Where can I find this teaching?

I have a Messianic Jewish friend that claims Christianity rejects them because the Jews killed Jesus. I know that is false in the Catholic world but I can’t find definitive statements toward that. I thought it was condemned as a heresy but no find so far. Can you give me some resources? Thanks.

Vatican II’s Nostra Aetate:

True, the Jewish authorities and those who followed their lead pressed for the death of Christ; still, what happened in His passion cannot be charged against all the Jews, without distinction, then alive, nor against the Jews of today. Although the Church is the new people of God, the Jews should not be presented as rejected or accursed by God, as if this followed from the Holy Scriptures. All should see to it, then, that in catechetical work or in the preaching of the word of God they do not teach anything that does not conform to the truth of the Gospel and the spirit of Christ…
…Besides, as the Church has always held and holds now, Christ underwent His passion and death freely, because of the sins of men and out of infinite love, in order that all may reach salvation. It is, therefore, the burden of the Church’s preaching to proclaim the cross of Christ as the sign of God’s all-embracing love and as the fountain from which every grace flows.

Catechism of the Catholic Church:

597 The historical complexity of Jesus’ trial is apparent in the Gospel accounts. The personal sin of the participants (Judas, the Sanhedrin, Pilate) is known to God alone. Hence we cannot lay responsibility for the trial on the Jews in Jerusalem as a whole, despite the outcry of a manipulated crowd and the global reproaches contained in the apostles’ calls to conversion after Pentecost. Jesus himself, in forgiving them on the cross, and Peter in following suit, both accept “the ignorance” of the Jews of Jerusalem and even of their leaders. Still less can we extend responsibility to other Jews of different times and places, based merely on the crowd’s cry: “His blood be on us and on our children!”, a formula for ratifying a judicial sentence. As the Church declared at the Second Vatican Council:
. . . [N]either all Jews indiscriminately at that time, nor Jews today, can be charged with the crimes committed during his Passion. . . [T]he Jews should not be spoken of as rejected or accursed as if this followed from holy Scripture.

All sinners were the authors of Christ’s Passion

598 In her Magisterial teaching of the faith and in the witness of her saints, the Church has never forgotten that “sinners were the authors and the ministers of all the sufferings that the divine Redeemer endured.” Taking into account the fact that our sins affect Christ himself, the Church does not hesitate to impute to Christians the gravest responsibility for the torments inflicted upon Jesus, a responsibility with which they have all too often burdened the Jews alone…

USCCB’s Guidelines for Catholic-Jewish Relations:

As the council statement requires, the presentation of the Crucifixion story should be made in such a way as not to implicate all Jews of Jesus’ time or of today in a collective guilt for the crime. This is important for catechesis and homilies, especially during Lent and Holy Week, as well as for any dramatizations of the events, such as Passion Plays.

USCCB’s Q & A about Catholic-Jewish Relations:

Q. Are the Jewish people guilty of killing Christ?

A. “Another misunderstanding rejected by the Second Vatican Council was the notion of collective guilt, which charged the Jewish people as a whole with responsibility for Jesus’ death… From the theory of collective guilt, it followed for some that Jewish suffering over the ages reflected divine retribution on the Jews for an alleged “deicide.” While both rabbinic Judaism and early Christianity saw in the destruction of the Jerusalem Temple in A.D. 70 a sense of divine punishment (see Lk 19:42-44), the theory of collective guilt went well beyond Jesus’ poignant expression of his love as a Jew for Jerusalem and the destruction it would face at the hands of imperial Rome. Collective guilt implied that because “the Jews” had rejected Jesus, God had rejected them. With direct reference to Luke 19:44, the Second Vatican Council reminded Catholics that “nevertheless, now as before, God holds the Jews most dear for the sake of their fathers; he does not repent of the gifts he makes or of the calls he issues,” and established as an overriding hermeneutical principle for homilists dealing with such passages that “the Jews should not be represented as rejected by God or accursed, as if this followed from Holy Scripture” (Nostra Aetate, no. 4; cf. 1985 Notes, VI:33).”(God’s Mercy Endures Forever, no. 7)

Further reading:

Guidelines for Implementing Nostra Aetate

Notes on the Correct Way to Present Jews and Judaism in Preaching and Catechesis in the Roman Catholic Church

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