Musannaf Ibn Abi Shayba 3:1988

'Abbad ibn al-'Awwam narrated to us, from Hajjaj, from Abu Ishaq, that 'Alqama, al-Aswad, Masruq, and 'Amr ibn Sharahil used to say: "If the prostration (sajdah) is at the end of the surah, it suffices you to bow (ruku') for it."