Musnad Abu Ya'la al-Mawsili 6:2

Abu Musa Muhammad ibn al-Muthanna narrated to us, Muhammad ibn Ja'far Ghundar narrated to us, Shu'bah narrated to us, from Qatadah, from Ikrimah, from Ibn Sa'd, from Sa'd, from the Prophet, may Allah bless him and grant him peace, regarding the plague: "If it occurs and you are in it, do not flee from it." Shu'bah said: Hisham Abu Bakr narrated to me that he is Ikrimah ibn Khalid.