If you sell the house than you will be required to pay back the $8000 tax credit that you received.
If the taxpayer sells the home, or the home ceases to be used as the taxpayer's (or the taxpayer's spouse's) principal residence within 36 months of purchase, the taxpayer will have to repay the credit. The repayment will be due on the tax return for the year in which the home is sold or ceases to be used as the principal residence.
Yes that is correct. Even if you buy another house you cannot keep the credit.