פירוש על עבודה זרה 94:10

The Talmud analyzes the underpinnings of Rav’s statement that if a person worships a house, he turns it into an idol that is now prohibited to Jews. A house consists of pieces that were once detached from the ground and now are attached. Things attached to the ground cannot become prohibited if they are worshipped. So it seems like Rav says although the house is currently attached, since its parts were once attached, it is still prohibited.