There is a famous quote of the Chasam Sofer, in which he applies the principle stated in Mishna 'Orlah 3:9 (החדש אסור מן התורה בכל מקום) to the question of innovation within Judaism. Rather than stating that "new [grain] is forbidden by the Torah in every place", ie: both within the land of Israel and outside of it, he instead uses the same quote to suggest that "innovation is forbidden by the Torah in every instance".
Can anybody please provide me with the exact reference for this teshuva of his?