مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2074
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Muhammad bin ‘Abdullah bin 'Amr bin 'Uthman, from his mother Fatimah bint Husain, that she heard Ibn 'Abbas say: The Messenger of Allah (ﷺ) said: "Do not keep staring at lepers."
Musnad Ahmad 2075lts isnad is da'eef]