Genesis 3 is the account of the fall of humanity, when sin first entered the world.
The serpent, described as "more subtil than any beast of the field," approached Eve in the Garden of Eden and questioned God's command not to eat from the tree of the knowledge of good and evil.
The serpent told Eve that eating the fruit wouldn't cause death but would make them like God, knowing good and evil.
Eve saw that the fruit looked good, desired its wisdom, and ate it. She then gave some to Adam, who also ate it.
Their eyes were opened, they realized they were naked, and they sewed fig leaves together in an effort to cover themselves.
When they heard God walking in the garden, Adam and Eve hid. God called out to them, and Adam admitted they hid because they were naked and afraid.
God asked if they ate from the forbidden tree. Adam blamed Eve, and Eve blamed the serpent.
In Genesis 2, God had said that they would "surely die" if they ate from that tree. In Genesis 3, He described the curse that was to be the indirect consequence of humanity's rebellion:
The serpent was cursed to crawl on its belly and eat dust, with enmity between it and the woman's offspring.The woman would experience pain in childbirth and be ruled by her husband.The man would toil amid thorns and thistles to produce food, eventually returning to dust.God made garments out of animal skins for Adam and Eve to wear.
God expelled Adam and Eve from Eden to prevent them from eating from the tree of life and living forever in their fallen state (with the curse). God placed cherubim and a flaming sword to guard the way to the tree of life.