Sunan An-Nasa'i

It was narrated from Ibn 'Abbas that the Messenger of Allah stood up and said:Allah, Most High, has decreed Hajj for you. Al-Aqra' bin Habis At-Tamimi said: ""Every year, O Messenger of Allah?"" But he remained silent, then he said: ""If I said yes, it would become obligatory, then you would not hear and obey. Rather it is just one Hajj