Narrated Zaid bin Yuthai':
We asked 'Ali what he had been dispatched with during the Hajj. He said: 'I was sent with four: That there shall be no Tawaf around the House while naked, that if there is a treaty between someone and the Prophet (ﷺ), then the treaty remains until its expiration, and whoever does not have a treaty, then he has the span of four months, none shall enter Paradise except a believer, and the idolaters and Muslims shall not congregate (for Hajj) after this year.'