It was narrated from 'Abdullah (رضي الله عنه) that

The Prophet (ﷺ) used to say: "Labbaika Allahumma labbaiyk, labbaika la shareeka laka labbaik. Innal-hamda wan-ni’mata laka (Here I am, Ο Allah, here I am. Here I am, You have no partner, here I am. Verily all praise and blessings are Yours).”