Sayyiduna Imran bin Husayn (may Allah be pleased with him) said: Know that the Messenger of Allah (peace and blessings be upon him) had some of his family perform Umrah in the first ten days of Dhu al-Hijjah, and the Messenger of Allah (peace and blessings be upon him) did not forbid it, nor was any verse revealed that abrogated it, until the Messenger of Allah (peace and blessings be upon him) passed away. And the Messenger of Allah (peace and blessings be upon him) said: "A group of the people of Islam will continue to fight for Islam, prevailing over those who oppose them, until they fight the Dajjal."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15302