It wasnarrated from Ibn 'Abbas that Aqra' bin Habis asked theProphet(ﷺ):
"O Messenger of Allah, is Hajj (required) every year,orjust once" He said: "Rather it is just once. And whoever canperform Hajj voluntarily, let him do so." (FR)
English reference (FR): Vol. 4, Book 25, Hadith 2886 (FR)
Arabic reference (FR): Book 25, Hadith 2997 (FR)