Arabic
لَبَّيْكَ اللّٰهُمَّ لَبَّيْكَ، لَبَّيْكَ لَا شَرِيكَ لَكَ لَبَّيْكَ، إِنَّ الْحَمْدَ وَالنِّعْمَةَ لَكَ وَالْمُلْكَ، لَا شَرِيكَ لَكَ
Meaning
Here I am, O Allah, here I am. Here I am, You have no partner, here I am. Verily all praise and grace are Yours, and the dominion. You have no partner.
Source
HadithBukhari 1549; Muslim 1184