Musannaf Ibn Abi Shaybah 15752 — On the day of Arafah: is the takbir

Abd al-Rahman bin Yazid said: I was with Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) at Arafah and he recited the Talbiyah. A man said: Who is this reciting the Talbiyah on this day? Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) turned to him and said: 'Labbayka adad al-turab, labbayk' (Here I am, as many times as the grains of dust, here I am).