One day Hazrat Umm Salmah (ra) was sitting with our Prophet pbuh along with Hazrat Maimunah (ra) or Hazrat Aisha (ra) when Hazrat ibn Umm Maktum (ra), who was a blind man, called upon our beloved Prophet pbuh.
The Holy Prophet pbuh asked them to observe purdah from him.
Hazrat Umm Salmah said, “Is he not a blind man? Neither will he see us nor recognise us.”
The Prophet pbuh replied, “Are you also blind? Do you not see him?”