"The first example of untouchability is seen after Islam came. It is seen when at Raja Dahir's household his queens were on the way to commit Johar. They mentioned the word 'Malechcha' and said they need to hurry for the Johar, else the 'Malechcha' would touch them and they will become impure. This is the first example of untouchability in Indian text."
Dalit

January 1, 1970