Abraham traveled to a place called Gerar. Because Abraham was afraid that the people there might kill him to take his wife Sarah, he told them that Sarah was his sister. This was not completely true because Sarah was his half-sister, but Abraham left out the fact that she was his wife. Abraham was trying to protect himself, but this was not the right choice.
Abimelek, the king of Gerar, took Sarah to his palace. But God came to Abimelek in a dream and warned him that Sarah was Abraham’s wife. God told Abimelek that if he did not return Sarah, he would die because he had taken another man’s wife.