"If you don't find a way to make money while you sleep, you will work until you die." These words of wisdom come from Berkshire Hathaway's legendary CEO Warren Buffett -- one of history's best dividend investors.

Incredibly, the Oracle of Omaha's investment conglomerate is on track to earn more than $6 billion over the next year just for sleeping on the stocks already in its portfolio. With that astounding level of passive income generation in mind, read on to see why two Fool.com contributors think that investors can score wins by adding these Buffett-backed dividend stocks to their own portfolios.

Keith Noonan: Buffett has famously said that his preferred holding period for stocks in the Berkshire Hathaway portfolio is "forever." Much of the investment conglomerate's incredible track record of success can be traced back to the Oracle of Omaha's focus on finding great businesses that are worth owning for the long haul.

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Source Fool.com