"A man came to the Prophet and said: 'O Messenger of Allah! What is it that makes Hajj obligatory?' He said: "The provisions and a means of conveyance."
Jami` at-Tirmidhi Book 9, Hadith 5
← Previous Hadith The Messenger of Allah said: "Whoever has the provisions and the means to convey him to Allah's House and he does not perform Hajj, then it does not matter if he dies as a Jew or a Christian. That is because Allah said in His Book: 'And Hajj to the House is a duty that mankind owes to Allah, for whomever is able to bear the journey.'

Jami` at-Tirmidhi Book 9, Hadith 4 Next Hadith → "When Allah revealed: And Hajj to the House is a duty that mankind owes to Allah, for whomever is able to bear the journey. They said: 'O Messenger of Allah! Is that every year?' He remained silent. So they said: 'O Messenger of Allah! Is that every year?' He said: 'No. If I had said yes, then it would have been made obligatory.' So Allah revealed: O you who believe! Do not ask about things which, if made plain to you, may cause you trouble.

Jami` at-Tirmidhi Book 9, Hadith 6