(an excerpt from BTG, by Bhakti Vikasa Swami)
This incident took place about 125 years ago. In the village of Bhugda, in the Karoli district, lived a family of gurjas (cowherds) who supplied milk for the service of Madana Mohana.
One of the women of this family used to come to see Madana Mohana and honor His prasädam. Madana Mohana was pleased with her devotional attitude.
One day Madana Mohana went to the village of Bhugda. The gurjari woman was lying on her bed chanting Madana Mohana’s name when suddenly she saw Madana Mohana Himself standing before her.
Surprised, she got up and touched His feet. She then spread a simple blue bedsheet on her cot and asked Madana Mohana to sit there. Madana Mohana took off His yellow outer dress, lay down on the cot, and went to sleep while the woman massaged His feet. Then she began fanning Him. But after some time she felt tired, and she also went to sleep.
When Madana Mohana awoke, He thought, “Oh, it’s almost time for My mangala-ärati. I’d better get back to the temple quickly.” Because He was rushing, He took the blue cloth of the gurjari woman and left behind his yellow garment.
When the priests woke Madana Mohana for mangala-ärati, they were surprised. “Where is His yellow cloth? Where has He gotten this simple blue cloth? We didn’t put Him to sleep like that.”
When the gurjari woman came for darshana that morning, she returned the Deity’s yellow garment. She told the priests that Madana Mohana had gone to her house and left it there and had taken her blue cloth.
This pastime took place on the Amavasya, the new-moon day. Now on every Amavasya, Madana Mohana wears blue cloth in memory of this event.
NoD 22, 40 states"Krishna becomes obliged to the loving spirit of the devotee and not exactly to the service rendered. No one can serve Krishna completely. He is so complete and self-sufficient that He has no need of any service from the devotee. It is the devotee's attitude of love and affection for Krishna that makes Him obliged. "