How Do You Attribute A Quote Quotes & Sayings

I found myself listening to Walter Bjork's fascinating radio program Bible Questionnaire (WFME, Orange, N.J.), and a caller asked where in the Bible one would find the statement "Neither borrower nor lender be." The poor host flipped like mad through his concordance without success. Naturally, since the quote is not from the Bible at all, but from Shakespeare's Hamlet! But it sounded biblical, so caller and host alike attributed it to scripture. Can it have been much more difficult to naively attribute wise sayings to Jesus? — Robert M. Price