17. "Then shall the priest command to take for him to be cleansed two live clean birds" (Vayikra 14:4). Rabbi Yitzchak and Rabbi Yosi were staying with Rabbi Shimon. One day, he said to them: It is known that a cedar tree IS TIFERET, for it is written, "From the cedar tree that is in Lebanon" (I Melachim 5:13). That cedar, WHICH IS TIFERET, can strike roots only in Lebanon, WHICH IS BINAH, and we have already learned this. BUT what is the point of the "hyssop that comes out of the wall" (Ibid.)?