مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3220
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Prophet (ﷺ) prayed Zuhr in Dhul-Hulaifah, then he called for his camel and he marked it with a cut on the right side of its hump and the blood flowed from it. Then he garlanded it with two sandals. Then he called for his mount and when he reached al-Baida', he entered ihram for Hajj.
Musnad Ahmad 3244lts isnad is saheeh, Muslim (1243)]