Musannaf Ibn Abi Shayba 17:1404

Abu Mu'awiyah narrated to us, from al-A'mash, from Ibrahim, from al-Aswad, who said: Alqama said to him, "O Abu 'Amr." He replied, "At your service (Labbayk)." Alqama said to him, "May your hands be at your service."