Abdullah bin Amir says: We offered the morning prayer behind Umar bin Khattab (may Allah be pleased with him). In the first rak'ah, he recited Surah Yusuf, and in the second, Surah Al-Hajj, and he recited slowly and gently. The narrator says: I said, "By Allah, then he must have performed that prayer at the time of sunrise." So Abdullah bin Amir (may Allah be pleased with him) said, "Yes."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 130
Hadith Takhrijصحیح اخرجه عبدالرزاق: 2715 - و ابن ابی شیبة: 3548 - والبيهقي: 389/2 وفي المعرفة السنن والآثار له (1190)