مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3113
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: If a drop of az-Zaqqoom... And he narrated the same report.
Musnad Ahmad 3137Its isnad is da'eef because of the weakness of Abu Yahya]