Śatapatha Brāhmaṇa ("of a hundred paths") 11.4.2.6

11.4.2.6

etaddha vai nyak yo'yamuccairādāya śanairnidadhāti sa yamicetpāpīyāntsyāditi tasyoccairādāya śanairnidadhyāttena sa pāpīyānbhavati

Now the descending mode, indeed, it is when he begins in a high tone and concludes in a low tone: whoever should wish that any one should be poorer, let him begin for him in a high tone and conclude in a low tone; and he will thereby become poorer.