Joe and Gavin Maloof give each 'Oprah's Big Give' contestant $100,000.

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In the $100,000 Giveaway Mission, each contestant has only 24 hours to donate their share of the $700,000…but there's a catch. They can't give away cash, they can't spend more than $500 on any one person and they can't give more than $10,000 at any single location.

To top it off, because the challenge is so big, two contestants will be sent home this week.