That we will always remember the sin of the golden calf. (Read more): exactly 50 days after the exodus from Egypt, the Israelites arrived at mount Sinai. Moses ascended to the mount and stayed there for forty days and nights. The Israelites thought he must be dead. They gathered all jewelry, melted it and created a huge golden sculpture in the shape of a calf and started to worship him. According to some scholars, that act reveals the human need to pray to something tangible and led to the building of the holy temple in Jerusalem.