Moshe goes up to the mountain, which is covered with a thick cloud. He remains in the divine presence for 40 days. A central theme of the saga of the Hebrews develops in this parashah: the idea of God dwelling among men. Mosheh hears His detailed instructions about building the Tabernacle. God says that all the Hebrews must contribute, according to the desire of their hearts, with the necessary materials for its making.