Sayyiduna Anas bin Malik (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) spent the night at Dhu al-Hulayfah until morning came. Then he mounted, and when he reached al-Bayda' he praised Allah, glorified Him and proclaimed His greatness, and called the talbiyah for Hajj and Umrah, and the people also called the talbiyah for both Hajj and Umrah. When we arrived, he (peace and blessings be upon him) gave the people the order and they came out of ihram, until, when it was the Day of Tarwiyah, they called the talbiyah for Hajj. And the Prophet (peace and blessings be upon him) sacrificed seven camels with his own hand while they were standing.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8831