Musannaf Ibn Abi Shayba 3:369

Abu Bakr narrated to us, he said: Malik ibn Isma'il narrated to us, he said: 'Abd al-Warith narrated to us, he said: Ishaq ibn Suwayd informed us, he said: I saw Abu Qatada al-'Adawi, when he prostrated, he would bring out his hands, and his hands would touch the ground.