Musannaf Ibn Abi Shayba 3:2130

Waki' narrated to us, from Sharik, from Ibn al-Asbahani, who said: Ibn Abi Layla led us in prayer, and he performed the taslim after two rak'ahs. We glorified Allah (subhanallah) for him, so he stood up and completed the prayer. When he finished, he performed two prostrations (sujud al-sahw). He said: I mentioned that to 'Ikrimah, and he said: "He did well."