Ahmad ibn ‘Abdullah ibn al-Hakam narrated to us, Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us — and Harun ibn ‘Abdullah narrated to me, and the wording is his — Rawh narrated to us, Shu‘bah narrated to us, from ‘Umar ibn Muhammad ibn Zayd, from his father, from Ibn ‘Umar, that the Messenger of Allah, peace and blessings be upon him, said: "Fever is from the heat of Hell, so cool it with water."