Muhammad ibn Mansur narrated to us: Ya'qub, meaning Ibn Ibrahim, narrated to us: My father narrated to us, from Ibn Ishaq, who said: Khusayf ibn Abd al-Rahman al-Jazari narrated to me, from Sa'id ibn Jubayr, who said: I said to Abdullah ibn Abbas: O Abu al-Abbas, I am amazed at the difference of opinion among the Companions of the Messenger of Allah (may Allah bless him and grant him peace) regarding when the Messenger of Allah (may Allah bless him and grant him peace) entered into Ihram when he made it obligatory.
He said: I am the most knowledgeable of the people regarding that. The Messenger of Allah (may Allah bless him and grant him peace) only performed one Hajj, and from there they differed. The Messenger of Allah (may Allah bless him and grant him peace) set out for Hajj, and when he prayed two rak'ahs in his mosque at Dhu al-Hulayfah, he made it obligatory while sitting in his gathering, so he pronounced the Talbiyah for Hajj when he finished his two rak'ahs. Some groups of people heard that from him, and I memorized it from him. Then he mounted, and when his camel stood up with him, he pronounced the Talbiyah, and some groups of people perceived that from him. That was because the people came in waves, so they heard him pronouncing the Talbiyah when his camel stood up with him, and they said: The Messenger of Allah (may Allah bless him and grant him peace) only pronounced the Talbiyah when his camel stood up with him.
Then the Messenger of Allah (may Allah bless him and grant him peace) proceeded, and when he ascended the height of al-Bayda', he pronounced the Talbiyah, and some groups perceived that from him, so they said: He only pronounced the Talbiyah when he ascended the height of al-Bayda'. By Allah, he made it obligatory at his place of prayer, he pronounced the Talbiyah when his camel stood up with him, and he pronounced the Talbiyah when he ascended the height of al-Bayda'.
Sa'id said: So whoever followed the opinion of Abdullah ibn Abbas entered into Ihram at his place of prayer when he finished his two rak'ahs.