Whenever Aswad bin Muttalib and his friends would see Rasulullah (sallallahu ‘alaihi wasallam) and his Sahaabah (radhiyallahu ‘anhum), they would wink their eyes at each other and mockingly say, “These are the people who will rule the earth and seize the treasures of Caesar and Chosroe.” Making these sarcastic remarks, they would whistle and clap their hands in mockery.
Rasulullah (sallallahu ‘alaihi wasallam) cursed Aswad in the following words, “O Allah! Make him blind (so that he is unable to wink his eyes in mockery) and destroy his son.” As a result, Aswad immediately became blind and his son was killed in the Battle of Badr.
At the time when the Quraish were making preparations for the Battle of Uhud, Aswad was ill, but he was still making an effort to incite the people against Rasulullah (sallallahu ‘alaihi wasallam). He died before the Battle of Uhud.
(Extracted from Seeratul Mustafa 1/221)