Bukhari :: Book 2 :: Volume 26 :: Hadith 663
Narrated Abu Said Al-Khudri:
The Prophet said "The people will continue performing the Hajj and 'Umra to the Ka'ba even after the appearance of Gog and Magog."
Narrated Shu'ba extra:
The Hour (Day of Judgment) will not be established till the Hajj (to the Ka'ba) is abandoned.
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