Cakradatta (Cikitsasangraha) 61.52

61.52

saptarātraprayogeṇa naraḥ śrutidharo bhavet .
nāgnirdahati tadveśma na vajraṃ hanti na grahāḥ .. 52 ..

by administration for seven nights, a man becomes capable of retaining what he hears. / Fire does not burn that house, lightning does not strike, nor do possessing spirits harm it;