Catholic teaching holds that those who are not in full communion with the Catholic Church, and who do not share the Church's beliefs about the Eucharist, should not receive Holy Communion. This applies to non-Catholics in general, including Jewish people.
The reasons behind this include:
* The Eucharist as a sign of unity: The Eucharist is seen as a sign of full communion and unity within the Catholic Church. Receiving Communion implies a shared belief in the teachings of the Church, including the Real Presence of Christ in the Eucharist.
* Respect for other faiths: The Catholic Church respects the beliefs and practices of other religions, including Judaism. Encouraging someone to receive Communion who does not share the Catholic understanding of the Eucharist would be seen as disrespectful to both their own faith and to Catholic beliefs.
* Proper disposition: Catholics are expected to be in a state of grace (free from mortal sin) and properly disposed before receiving Communion. This involves understanding the significance of the Eucharist and preparing oneself spiritually.
It is important to note that this restriction is based on religious belief and practice, and is not intended as a form of discrimination or prejudice against Jewish people or any other group.