Sunan an-Nasai Book 24, Hadith 2747

أَخْبَرَنَا عِيسَى بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا ابْنُ وَهْبٍ، قَالَ أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ إِنَّ سَالِمًا أَخْبَرَنِي أَنَّ أَبَاهُ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُهِلُّ يَقُولُ ‏ "‏ لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ لَبَّيْكَ لاَ شَرِيكَ لَكَ لَبَّيْكَ إِنَّ الْحَمْدَ وَالنِّعْمَةَ لَكَ وَالْمُلْكَ لاَ شَرِيكَ لَكَ ‏"‏ ‏.‏ وَإِنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ يَقُولُ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَرْكَعُ بِذِي الْحُلَيْفَةِ رَكْعَتَيْنِ ثُمَّ إِذَا اسْتَوَتْ بِهِ النَّاقَةُ قَائِمَةً عِنْدَ مَسْجِدِ ذِي الْحُلَيْفَةِ أَهَلَّ بِهَؤُلاَءِ الْكَلِمَاتِ ‏.‏

It was narrated that Ibn Shihab said:"Salim told me that his father said: "I heard the Messenger of Allah say the Talbiyah: "Labbaika Allahumma Labbaik, Labbaika La sharika laka Labbaik. Innal-hamda wan-ni'mata laka wal-mulk, la sharika lak (Here I am, O Allah, here I am. Here I am, You have no partner, here I am. Verily all praise and blessings are Yours, and all sovereignty, You have no partner)." 'Abdullah bin 'Umar used to say: "The Messenger of Allah used to pray two Rak'ahs in Dhul-Hulaifah, then when his she-camel stood up straight with him at the Masjid of Dhul-Hulaifah, he would enter Ihram saying these words