Original: The Oath was a pledge signed by 576 out of the 577 members from the Third Estate and a few members of the First Estate during a meeting of the Estates-General of 20 June 1789 in a tennis court building near the Palace of Versailles .
Simplified: The oath was a pledge signed by 576 members out of 577 of France 's Third Estate and a few members of the Second Estate on June 20 , 1789 in a tennis court near the Palace of Versailles .