As early as A.D. 598, Gregory the Great clearly laid
down that the Jews, while they were to be restrained
from presuming upon the toleration accorded to
them by the law, had a claim to be treated equitably
and justly. They were to be allowed to keep their
own festivals and religious practices, and their rights
of property, even in the case of their synagogues,
were to be respected (Greg. Mag. Regesta, M. G. H.,
II, 67 and 383).
In the later Middle Ages there may be traced
through a long series of pontificates the repeated
confirmations of the Bull, assignable probably in the
first instance to Pope Callixtus II (c. 1120) and
known as "Sicut Judæis". It was a sort of papal
charter of protection to the Jews and in its first
sentence are embodied certain words of one of
Gregory the Great's letters just referred to. "As
licence", says this document, "ought not to be
allowed to the Jews to presume in their synagogues
beyond what is permitted by the law so they ought
not to be interfered with in such things as are
allowed. We therefore, although they prefer to
continue in their hardness of heart rather than be
guided by the hidden meaning of the prophets to a
knowledge of the Christian faith, do nevertheless,
since they invoke our protection and aid, following
in the footsteps of our predecessors and out of the
mildness of Christian piety, extend to them the
shield of our protection." The document then lays
down;
- that the Jews are not to be compelled by force to embrace Christianity, but are only to be baptized of their own free will;
- that apart from a judicial sentence in a court of law no one is to injure them in life or limb or to take away their property or to interfere with such customary rights as they may have enjoyed in the places where they live;
- that they are not to be attacked with sticks and stones on occasion of their festival celebrations, nor are they to be compelled to render any feudal services beyond such as are customary;
- that their cemeteries in particular are not to violated. (See M. Stern, "Urkundliche Beiträge", n. 171.)
- This charter reissued and confirmed as it was by some twenty or thirty pontiffs during a period of 400 years is certainly of much more weight as laying down the Church's view of the duty of toleration, as an abstract principle, than any persecuting edicts evoked by special circumstances or coloured by the prepossessions of the individual legislator.
https://www.newadvent.org/cathen/14761a.htm