Sunan Abu Dawud
1795
Sahih+3

Anas bin Malik said I heard the Apostle of Allaah(ﷺ) uttering talbiyah(labbaik) aloud for both Hajj and ‘Umrah. He was saying in a loud voice “Labbaik for ‘Umrah and Hajj, labbaik for ‘Umrah and Hajj”

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid