Hadithcore
Mishkat al-Masabih, 2541

Ibn ‘Umar said that he heard God’s messenger say when with his hair matted he raised his voice in the <i>talbiya</i>, “<i>Labbaik</i>, O God, </i>labbaik labbaik</i>; You have no partner; <i>labbaik</i>; praise and grace are Your, and the dominion; You have no partner,” saying nothing more than these words. Bukhari and Muslim.

وَعَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُهِلُّ مُلَبِّدًا يَقُولُ: «لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ لَبَّيْكَ لَا شَرِيكَ لَكَ لَبَّيْكَ إِنَّ الْحَمْدَ وَالنِّعْمَةَ لَكَ وَالْمُلْكَ لَا شَرِيكَ لَكَ» . لَا يَزِيدُ عَلَى هَؤُلَاءِ الْكَلِمَاتِ

References1 variant
In-Book Reference
Book 10, Hadith 35