Brihadâranyaka Upanishad: V, 11
ELEVENTH BR HMANA.
This is indeed the highest penance, if a man, laid up with sickness, suffers pain
1He who knows this, conquers the highest world.
This is indeed the highest penance, if they carry a dead person into the forest
2He who knows this, conquers the highest world.
This is indeed the highest penance, if they place a dead person on the fire
3He who knows this, conquers the highest world.