Leviticus, a priestly book, has as its primary focus an emphasis on the cleanliness of the community and its adherence to ritual matters for the sake of God’s blessings. … In the portion called, Emor, a significant redundancy occurs in the Hebrew text. We read that God said to Moses: Emor el hakohanim b’nei Aharon, ve-amarta aleihem… “Speak to the priests, the sons of Aaron, and you shall say to them…” (Leviticus 21:1).
Literally, “four species.” The Torah specifies four species to bring together on Sukkot. The four species are: lulav (branches of palm trees), etrog (citron), hadasim (myrtle branches), and aravot (willows) (Leviticus 23:40).