"The Synagogue is a godless house, a collection of wickedness, and God Himself has damned it." ~ St. Ambrose

Feast: December 7

Saint Ambrose was one of the four original doctors of the Church, he is also remembered as the teacher who converted and baptized St. Augustine of Hippo.

Ambrose's writings on the Jews. 

"The faithlessness of the Synagogue is an insult to the Savior. Therefore, He chose the barque of Peter and deserted the boat of Moses; that is, He rejected the faithless Synagogue and adopted the believing Church ... Of these two ships, one is left at the shore, idle and empty; the other, loaded filled, is launched into the deep. For the Synagogue is left idle on the beach. Because of its own fault, it has lost Christ along with the warnings of the prophets. But the freighted Church is taken out into the deep, because it received the Lord together with the teaching of the Apostles. The Synagogue, I say, remains on the land, held fast as it were to earthly things. The Church is called forth to the deep, as though to search into the profound mysteries of Heaven." ~ St. Ambrose

"O Jewish hearts, harder than rocks!" ~ St. Ambrose 

AMBROSE; The Jew requires a kid, the Christian a lamb, and therefore is Barabbas released to them, to us a lamb is sacrificed. Which thing also is seen in the kid, because the Jews have lost the ancient rite of sacrifice. Or they who seek for a kid wait for Antichrist. (The Catena Aurea Gospel of Saint Luke - Saint Thomas Aquinas)

AMBROSE; Not unreasonably do they seek the pardon of a murderer, who were themselves demanding the death of the innocent. Such are the laws of iniquity, that what innocence hates, guilt loves. And here the interpretation of the name affords a figurative resemblance, for Barabbas is in Latin, the son of a father. Those then to whom it is said, You are your father the Devil, are represented as about to prefer t the true Son of God the son of their father, that is, Anti Christ. (The Catena Aurea Gospel of Saint Luke - Saint Thomas Aquinas)

St. Ambrose 
"Even heretics appear to possess Christ, for none of them denies the name of Christ. Still, anyone who does not confess everything that pertains to Christ does in fact deny Christ." 

1 Corinthians 16: ²² If any man love not our Lord Jesus Christ, let him be anathema, maranatha.

Hebrews 8:7-9 

⁷ For if that first covenant had been faultless, there would have been no need to look for a second one.
⁸ God^[a] finds fault with them when he says:

“The days are surely coming, says the Lord,
    when I will establish a new covenant with the house of Israel
    and with the house of Judah;
⁹ not like the covenant that I made with their ancestors,
    on the day when I took them by the hand to lead them out of the land of Egypt;
for they did not continue in my covenant,
    and so I had no concern for them, says the Lord.

Council of Florence (XVII Ecumenical)

The legalities of the Law of Moses may not be observed without the loss of eternal salvation.

Pope Benedict XIV

The observance of the annulled ceremonies of the Mosaic Law constitutes a sin

 It is a mortal sin to observe the old rites after the Passion of Christ. (Saint Thomas Aquinas. Summa Theologica I-II, q.103, a.4, s.c. /co)

Saint Ambrose judges Francis’ heresies