To see whether one is reborn as a human; when one who does the right thing for Buddhism is just about to die, if the feet begin to become cold, then the navel does, but if the parts of top of it remain warm until one's life ends, then one will be reborn as a human.
験生人中、もし作善の人、将に死せんとする時、まず足より冷えて臍（へそ）に至り、臍の上猶温にして後に気尽くるは即ち人中に生ず