Said R’ Akiva: From where do we learn that [an object of] idolatry transmits tumah-contamination by carrying, like a menstruant? For it is stated: Cast them away like a menstruant. ‘‘Go out!’’ shall you say to it (Isaiah 30:22). Just as a menstruant transmits tumah-contamination by carrying, so does [an object of] idolatry transmit tumah-contamination by carrying.