(V.3:97)
a) The performance of Hajj is an enjoined duty and its superiority, and the Statement of Allâh عز وجل: "Hajj (pilgrimage) to the House (Ka‘bah), is a duty that mankind owes to Allâh, those who can afford the expenses (for one’s conveyance, provision and residence); and whoever disbelieves [i.e. denies Hajj (pilgrimage to Makkah), then he is a disbeliever of Allâh], then Allâh stands not in need of any of the ‘Âlamîn." (V.3:97) (Sahih Al-Bukhâri, Vol.2, Chapter 1, The Book of Hajj, P. 344).
b) Islâm demolishes all the previous evil deeds and so do migration (for Allâh’s sake) and Hajj (pilgrimage to Makkah) [Al-Lû’lû wal-Marjân] (Sahih Muslim ).