It wasnarrated from Ibn 'Umar that the Messenger of Allah (ﷺ)said:
"Whoever enters Ihram for Hajj and 'Umrah, one Tawaf issufficient for both, and he should not exit Ihram until he hascompleted his Hajj, when he should exit Ihram for both."
English reference: Vol. 4, Book 25, Hadith 2975
Arabic reference: Book 25, Hadith 3089