Musannaf Ibn Abi Shaybah

Hasan narrates that during the time of Abdullah ibn Abbas, people were in doubt about the rising of dawn. He ordered his muezzin, who then gave the iqamah again, and Abdullah ibn Abbas (may Allah be pleased with them both) stepped forward and led the prayer. He recited the entire Surah Al-Baqarah, then performed ruku, then performed sajdah, then stood for the second rak'ah and recited the entire Surah Aal-e-Imran. Then he performed ruku and then sajdah. When the prayer was finished, it had become light.