The Prophet (ﷺ) 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.
Sahih al-Bukhari Book 25, Hadith 79
← Previous Hadith The people used to fast on 'Ashura (the tenth day of the month of Muharram) before the fasting of Ramadan was made obligatory. And on that day the Ka`ba used to be covered with a cover. When Allah made the fasting of the month of Ramadan compulsory, Allah's Messenger (ﷺ) said, "Whoever wishes to fast (on the day of 'Ashura') may do so; and whoever wishes to leave it can do so."

Sahih al-Bukhari Book 25, Hadith 78 Next Hadith → (One day) I sat along with Shaiba on the chair inside the Ka`ba. He (Shaiba) said, "No doubt, `Umar sat at this place and said, 'I intended not to leave any yellow (i.e. gold) or white (i.e. silver) (inside the Ka`ba) undistributed.' I said (to `Umar), 'But your two companions (i.e. The Prophet (ﷺ) and Abu Bakr) did not do so.' `Umar said, They are the two persons whom I always follow.' "

Sahih al-Bukhari Book 25, Hadith 80