Abram requested a sign from G‑d that his descendents would inherit the land of Canaan. G‑d responded in the famous "Covenant Between the Parts." Abram and the Divine Presence passed between an assortment of halved animals, and G‑d told Abram that his descendants would be exiled and in bondage for four hundred years. At the conclusion of this period, Abram's descendents would leave with great wealth, G‑d would punish the nations which enslaved them, and Abram's children would inherit the lands of Canaan. Following this pact, Sarai — seeing that she and Abram were still childless — suggested that Abram father a child with her Egyptian maid, Hagar. Hagar conceived and began to mistreat her mistress Sarai, who responded with a heavy hand, prompting Hagar to flee. Hagar encountered an angel who encouraged her to return to Sarai, promising her that the child she will bear will become a great nation. She obeyed, and gave birth to Ishmael. At the very end of this section, G‑d added the letter hey to Abram's name, making it "Abraham."