Musnad Ahmad 2717
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Mujahid that the people were circumambulating the Ka'bah and Ibn 'Abbas (رضي الله عنه) was sitting and had a crooked stick with him. The Messenger of Allah (ﷺ) said: "O you who believe! Fear Allah (by doing all that He has ordered and by abstaining from all that He has forbidden) as He should be feared. (Obey Him, be thankful to Him, and remember Him always), and die not except in a state of Islam (as Muslims (with complete submission to Allah))” (Al ‘Imran 3:102). (Then he said:) “If a drop of Zaqqoom were to be dropped on the earth, it would make the lives of the people of this world bitter, so how about those who have no food other than az-Zaqqoom?"