He took a dive

Martin Luther 1523:

If I had been a Jew and had seen such dolts and blockheads govern and teach the Christian faith, I would sooner have become a hog than a Christian. They have dealt with the Jews as if they were dogs rather than human beings; they have done little else than deride them and seize their property.

from "That Jesus was born a Jew"

Martin Luther 1543:

On the Jews and Their Lies

from "On the Jews and Their Lies"