Uttanka and Krishna
From Krishna Uttanka had received the favor of never having to be without water. When he got into trouble, Indra appeared in disguise of a hunter but Uttanka did not accept anything from this ‚lowly‘ person.
Krishna appeared and explained to him that Indra had the nectar of immortality ready for him. It was all just a test. Krishna gave him water and left.
Read the story here
http://hindumythologyforgennext.blogspot.com/2012/08/krishna-and-uttanga.html