Abu Dawud
The Rites of Hajj
Book Number: 004 / Hadith Number: 1794
Narated By Umar ibn al-Khattab : As-Subayy ibn Ma'bad said: I raised my voice in talbiyah for both of them (i.e. umrah and hajj). Thereupon Umar said: You were guided to the practice (sunnah) of your Prophet (pbuh).