More here, the U.S. is also pressuring them to stop the bid.
http://www.jpost.com/DiplomacyAndPolitics/Article.aspx?id=286660
Israel has opposed all Palestinian unilateral statehood bids at the UN, fearing that it would harm the peace process by empowering Palestinians to wage a diplomatic war on Israel.
Israel has called on the Palestinians to pursue statehood through a negotiated two-state solution that would end the conflict between them.
“We hope the Palestinians will seriously rethink their strategy,” an Israeli official told The Jerusalem Post on Thursday.
“If they chose to do this it will be a mistake.
It will hurt peace and it will not bring the realization of a Palestinian state forward, it will push it back,” the official said.