Sunan Ibn Majah
2920
Sahih+3

It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) used to say in his Talbiyah:“Labbaika ilahal-haqq, labbaika (Here I am, O god of Truth, here I am).”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi