Musnad Ahmad Hadith 2349

I am the most knowledgeable of the people regarding this. The Messenger of Allah (ﷺ) only did Hajj once, and this is why they differed: the Messenger of Allah (ﷺ) set out for Hajj, and when he had prayed two rak'ahs in his mosque in Dhul-Hulaifah, he entered ihram where he was sitting (after prayer) and recited the Talbiyah for Hajj after completing his two rak'ahs. Some people heard that and remembered it. Then he mounted his camel, and when it stood up with him, he recited the Talbiyah and some people heard that. The people used to come to him in groups, and they heard him recite the Talbiyah when his camel stood up with him, so they said: The Messenger of Allah (ﷺ) recited the Talbiyah when his camel stood up with him. Then the Messenger of Allah (ﷺ) continued onwards, and when he reached the peak of al-Baida’, he recited the Talbiyah. Some people heard that, so they said: The Messenger of Allah (ﷺ) recited the Talbiyah when he reached the peak of al-Baida'. By Allah, he entered ihram at the place where he had prayed, and he recited the Talbiyah when his camel stood up with him, and he recited the Talbiyah when he reached the peak of al-Baida'. Whoever follows the view of 'Abdullah bin ‘Abbas would enter ihram from the place where he prays when he finishes the two rak'ahs.