What is the second book of the Bible's Old Testament?

The Book of Exodus is the second book of the Bible. It narrates the story of the Exodus, in which the Israelites leave slavery in Biblical Egypt through the strength of Yahweh, who has chosen them as his people. The Israelites then journey with the prophet Moses to Mount Sinai, where Yahweh gives the 10 commandments and they enter into a covenant with Yahweh, who promises to make them a "holy nation, and a kingdom of priests" on condition of their faithfulness. He gives them their laws and instructions to build the Tabernacle, the means by which he will come from heaven and dwell with them and lead them in a holy war to possess the land of Canaan (the "Promised Land"), which had earlier, according to the story of Genesis, been promised to the seed of Abraham.

Source: Wikipedia