Shatapatha Brahmana 13.1.9.10

13.1.9.10

nikāme naḥ parjanyo varṣatviti nikāmenikāme vai tatra parjanyo varṣati yatraitena yajñena yajante phalavatyo na oṣadhayaḥ pacyantāmiti phalavatyo vai tatrauṣadhayaḥ pacyante yatraitena yajñena yajante yogakṣemo naḥ kalpatāmiti yogakṣemo vai tatra kalpate yatraitena yajñena yajante tasmādyatraitena yajñena yajante kLptaḥ prajānāṃ yogakṣemo bhavati

'May Parganya rain for us whensoever we list!'--where they perform this sacrifice, there Parganya, indeed, rains whenever they list;--'may our fruit-bearing plants ripen!'--there the fruit-bearing plants indeed ripen where they perform this sacrifice;--'may security of possession be assured for us!'--where they perform this sacrifice there security of possession indeed is assured; whence wherever they perform this (Asvamedha) sacrifice, security of possession becomes assured to the people.