An agnostic, Rubinstein was proud of his Jewish heritage. He was a great friend of Israel, which he visited several times with his wife and children, giving concerts with the Israel Philharmonic Orchestra, recitals, and master classes at the Jerusalem Music Centre. In 1949, Rubinstein—who lost family members in the Holocaust—along with other prominent musicians (including Horowitz and Heifetz) announced that he would not appear with the Chicago Symphony if it engaged the conductor Wilhelm Furtwängler, who had remained in Germany during the war and who had performed a symphony for Hitler's birthday.
From the Wikipedia page of Arthur Rubinstein, the Polish-American pianist widely considered to be one of the greatest interpreters of Chopin of all time. I am listening to Arthur Rubinstein perform Chopin’s mazurkas right now. Rubinstein was deeply attached to Poland, once performing the Polish national anthem to great acclaim after being angry that a Polish delegation had not been invited.