Abdullah bin Mas'ud (may Allah be pleased with him) said the talbiyah when departing from Jam' (Muzdalifah), and it was said: This is a bedouin. Abdullah (may Allah be pleased with him) said: "I heard the one upon whom Surah al-Baqarah was revealed saying at this very place: 'Labbayk Allahumma labbayk' (Here I am, O Allah, here I am)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9444