مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3148
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (رضي الله عنه) that The Prophet (ﷺ) said: "This is an 'Ummah which we lave joined to Hajj. Whoever does not have a sacrificial animal with him, let him exit ihram completely, for Umrah, has been joined to Hajj until the Day of Resurrection.”
Musnad Ahmad 3172lts isnad is saheeh, Muslim (1241)]