Cakradatta (Cikitsasangraha) 65.29

65.29

etatprāśitamātreṇa vāgviśuddhiśca jāyate .
saptarātraprayogeṇa kinnaraiḥ saha gīyate .. 29 ..

As soon as this is ingested, purification of speech arises; / with use for seven nights, one sings like the Kiṃnaras;