The idea that you should have a cash reserve equal to three to six months of your living expenses would almost certainly make any “Ten Commandments” list for personal finance.
It might also be one of the least obeyed commandments, as suggested in a recent post by my colleague Ellen Rinaldi. I wholeheartedly agree with Ellen’s emphasis on having a cash reserve—savings stashed in a bank account or money market fund—before getting too focused on investing.