Abu Dawud
Prayer
Book Number: 002 / Hadith Number: 1273
Narated By Abdullah ibn Umar : Yasar, the client of Ibn Umar, said: Ibn Umar saw me praying after the break of dawn. He said: O Yasar, the Apostle of Allah (pbuh) came to us while we were offering this prayer. He (the Prophet) said: Those who are present should inform those who are absent: Do not offer any prayer after (the break of) dawn except two rak'ahs.