From Chabad.org: This week’s reading, Naso, is the longest single portion in the Torah, containing 176 verses. The reading starts with a continuation of the Levite census and a discussion regarding their Tabernacle duties. The laws of the sotah woman and the Nazirite follow. The portion concludes with the Priestly Blessing and the offerings which the Tribal leaders brought in honor of the Tabernacle inauguration.
In the first Aliya, G‑d informs Moses of the Tabernacle duties of the Levite families of Gershon and Merari. When the Jewish people journeyed, the Gershon family transported the Tabernacle tapestries, veils and coverings, while the Merari family carried its structural components, such as the beams, boards and pillars. A final count is given of the Levite Kehot family — those between the ages of thirty and fifty, as per G‑d’s command mentioned towards the end of last week’s reading: 2,750.