Abraham and Sarah have to move and find themselves in a compromised situation where they lie thinking they will protect Abraham's life. But God intervenes and comes in a dream to the pagan King Abimelech and saves him from violating Sarah who had already been brought to his palace. Apparently she is a very attractive woman at the age of 90 that would prompt the king to send for her. This is a very fascinating story of God's intervention on Sarah's behalf. Notice how the innocent seem to get the punishment and the guilty are not reprimanded.