God tells Abraham to leave Ur and go to a land that God promised to him, the Promise Land. When Abraham heard God's calling, he went to the Promise Land where God told Abraham his descendants would inherit the Canaanite land.
Leave Ur. You must go to this specific land, that land I will promise for you to have.
A famine in the land (Promise Land) forced Abram and his people to move on to Egypt. Fearful that Abimelek king of Gerar would kill Abram for his beautiful wife, Abram asked Sarah to pretend she was his sister instead. Pharaoh noted Sarah and took her as a concubine. For this, God struck the Pharaoh with a plague and revealed Sarah's true identity. Angry with Abram, Pharaoh returned Sarah and asked them to leave Egypt. Abram left with carts of wealth.
According to Judaism and Christianity, Isaac is the son whom the offering story is about. According to Islamic interpretation, Ishmael is the son in the story. Either way, Abraham was asked in a test of faith by God to take one of his sons onto Mount Moriah and sacrifice him as a burnt offering. At the time, children were often sacrificed as burnt offerings to a variety of deities.
I have to sacrifice you to God for a reason Isaac. I hope you understand what I will do.