佛說觀佛三昧海經 4.23

4.23

"If a monk enters this samādhi, his body is like a plantain tree, lacking solidity. When emerging from the samādhi, the limbs and joints of his body will all ache and go numb; if he does not take medicine, he will go mad and die. He should take measures to regulate with diverse medicines as appropriate. One who engages in this contemplation expels the sins of birth and death of countless kalpas, like a great torrent of water, and before long will attain the path of an arhat."