مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4204
Musnad of Abdullah bin Mas'ood
It was narrated that `Abdullah said: The Messenger of Allah (ﷺ) said… And he mentioned something similar except that he said: ascribing a rival to Allah.
Musnad Ahmad 4232lts isnad is saheeh, al-Bukhari (1238) and Muslim (92)]