It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Leave the Abyssinians alone (do not provoke them) as long as they leave you alone, for no one will take out the treasure of the Ka'bah except that thin-shanked man from Abyssinia." This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it. However, both of them agreed on recording this hadith narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The Ka'bah will be demolished by the short-shanked man from Abyssinia."

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The Hour will not be established until the pilgrimage (Hajj) to the House of Allah is abandoned." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but the two Shaykhs did not record it in their books.

Imam Abu Dawud has also narrated this report through Shu'bah as mawquf (as the statement of the Companion). And Allah knows best.

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The House of Allah will certainly be visited for Hajj and Umrah even after the emergence of Gog and Magog (Ya'juj and Ma'juj)." (Imam al-Hakim says:) So it is possible that the performance of Hajj and Umrah continues for some time after that (the tribulation of Gog and Magog), and then after that Hajj ceases completely.