The Compendium of Kāśyapa 8.1.6

8.1.6

pretajvaro grahotthaśca viṣamaḥ kena hetunā
tadidānīṃ yathākālaṃ vaktavyo'vayavādyathā

And by what cause is the fever due to ghosts or arising from seizing spirits intermittent? / Therefore now, in due time, it should be stated part by part, as appropriate;