when krishna stayed at gurukula.The mother of gurukula who was respectively known gurumaa
told krishna and sudhama(best friend of krishna) to bring pieces of wood for ashrama (at ujjaini)for cooking food.
Then krishna told gurumaa that then we both have to go soon because the rain is about to come and if rain arrived the wood will become wet and it will not burn
and krishna and sudhama both went to jungle and started collecting wood.And the rain arrived.
Then krishna told sudhama to have rest on the branches of a tree and like that krishna and sudhama went near the tree to take rest.
while taking rest krishna became sleepy and slept for a long time.And after some time the rain came to an end and krishna also waked up.
krishna became hungry and asked for some channa which was given by gurumaa(mother of gurukul)when leaving to jungle for collecting wood.
But sudhama lied to krishna that "I think that it had fallen on the way"sorry krishna.But really Sudhama ate it when he became very hungry.Then both returned to gurukula.
And when gurumaa asked sudhama whether he had given little bit of chaana to krishna or had eaten it alone!
Then krishna told gurumaa that
"Gurumaa I remained hungry sudhama ated it alone!"then gurumaa became angry and coursed sudhama that
" In which way krishna remained hungry in the jungle in that way you will suffer with hungriness for your lifetime.