Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says, concerning the saying of Allah Almighty, "And Hajj to the House is a duty owed to Allah by the people, for whoever is able to find a way to it" [Surah Al Imran: 97]: The "way" is that a person's body is healthy and that the money for provision and a mount is readily available to him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8641