The Torah says that the Amaleik came and battled Israel at Refidim. I read somewhere: That according to the sages, the Jews were actually attacked because they lacked unity. This is alluded to in the very same name of the location where the battle occurred - Refidim - a name that is etymologically related to the Hebrew word pirud, meaning "disunity." Only through teamwork are battles won.
Is there a source for this?