مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2659
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: "Beware of narrating from me anything but what you know. Whoever tells a lie about me deliberately, let him take his place in Hell."
Musnad Ahmad 2675Saheeh because of corroborating evidence]