On The The Common Cold

‘Ali b. al-Khalil narrated from ‘Abd al-Aziz b. al-Hassan from Hammad b. ‘Isa from Hariz b. ‘Abd Allah al-Sijistani from Abu ‘Abd Allah, peace be upon him, who said to his children's teacher: “If any of my children are affected with a cold, inform me.” The teacher would inform him, but he said nothing in response. So the teacher said: “You instructed me to inform you of this. I have informed you, but you did not answer me with anything.” He replied: “It [the cold] is not from anything but a strain of leprosy in him. When it stirs up, Allah repels it with a cold.”