Vayikra Rabbah

We are all familiar with the famous midrash (Vayikra Rabbah 30, 12) that compares the four species we take on the holiday of Sukkos to the four different types of Jews: the esrog, which has both smell and taste, corresponds to those who learn Torah and perform good deeds; the lulav, which has taste but no smell, corresponds to those who learn Torah but do not perform good deeds; the hadasim, which have a pleasant smell but no taste, correspond to those who perform good deeds but do not learn Torah; and finally, the aravos, which have neither smell nor taste, correspond to those who have neither Torah nor good deeds.