سنن النسائي

It was narrated from Ibn 'Abbas that the Messenger of Allah (ﷺ) 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."