Srimad Bhagavatham : 6.3.4.
Skandham-6 Chapter-3. Slokam-4. yamaduta uvaca kati santiha sastaro jiva-lokasya vai prabho trai-vidhyam kurvatah karma phalabhivyakti-hetavah. yamadutah uvaca = the order carriers of Yamaraja said; kati = how many; santi = are there; iha = in this world; sastarah = controllers or rulers; jiva-lokasya = of this material world; vai = indeed; prabho = O master; trai-vidhyam = under the three modes of material nature; kurvatah = performing; karma = activity; phala = of the results; abhivyakti = of the manifestation; hetavah = causes. The Yamadutas said: Lord, how many controllers or rulers are there in this material world? How many causes are responsible for manifesting the various results of activities performed under the three modes of material nature [sattva-guna, rajo-guna and tamo-guna]? The Yamadutas, the order carriers of Yamaraja, were so disappointed that they asked their mast