Once upon a time, there was a saint named Kabir Das. Apart from being a saint he was a poet also.
Once he went to take a bath in holy river Ganga. After taking bath he sat down at the river bank. Then few Brahmins come reached there. But they do not have a mug. Kabir Das understood there problem and said, “ you peoples can take my mug.” Then a Brahman said, “ How can we take this dirty mug”.
“But I have washed it”, Said Kabir Das. The other one said, “ but it has touched by an untouchable like you.” Kabir Das replied’ “ if a mug can become dirty with my touch then I have just touched the Ganga also. While taking bath. It would also become dirty. Now you have to bring a new Ganga.
The Brahmins realized and accepted the mug from Kabir Das