Arcana Coelestia #1209
1209. That 'Gerar' means things that have been revealed concerning faith, and thus in general means faith itself, becomes clear from the places where Gerar is mentioned, as in Genesis 20:1; 26:1, 17, whose meaning will in the Lord's Divine mercy be explained later on.
Genesis 20:1
1
Abraham traveled from there toward the land of the South, and lived between Kadesh and Shur. He lived as a foreigner in Gerar.