مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2951
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 except what you are certain of, for whoever tells a lie about me deliberately, let him take his place in Hell. And whoever tells a lie about the Qur'an without knowledge, let him take his place in Hell.”
Musnad Ahmad 2974lts isnad is da'eef]