"The Church's stated attitude against the mistreatment of jews goes back to the early Church. Around 400, St Augustine, one of the most influential and foundational figures of Catholic theology, preached that the jews must be protected for their ability to explain the Old Testament."
Furthermore...
"Christians were nevertheless duty-bound to protect the jews as an important part of Christian civilization..."
The whole article does not mention once what the mistreatment is based upon...
https://en.wikipedia.org/wiki/Sicut_Judaeis
"The Church's stated attitude against the mistreatment of jews goes back to the early Church. Around 400, St Augustine, one of the most influential and foundational figures of Catholic theology, preached that the jews must be protected for their ability to explain the Old Testament."
Furthermore...
"Christians were nevertheless duty-bound to protect the jews as an important part of Christian civilization..."
The whole article does not mention once what the mistreatment is based upon...