It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The Hour will not be established until the pilgrimage to the House of Allah is abandoned."
Hadith Referenceسلسله احاديث صحيحه / الفتن و اشراط الساعة والبعث / 3576