Ki Tisa, Ki Tissa, Ki Thissa, or Ki Sisa (כִּי תִשָּׂא — Hebrew for "when you take," the sixth and seventh words, and first distinctive words in the parashah) is the 21st weekly Torah portion (parashah) in the annual Jewish cycle of Torah reading and the ninth in the Book of Exodus. The parashah tells of building the Tabernacle, the incident of the Golden calf, the request of Moses for God to reveal God's Attributes, and how Moses became radiant.
(summary from Wikipedia.org)
