Shatapatha Brahmana 13.1.4.3

13.1.4.3

tadāhuḥ pra vā etadaśvo mīyate yatparāṅeti na hyenam pratyāvartayantīti yatsāyaṃ dhṛtīrjuhoti kṣemo vai dhṛtiḥ kṣemo rātriḥ kṣemeṇaivainaṃ dādhāra tasmātsāyam manuṣyāśca paśavaśca kṣemyā bhavantyatha yatprātariṣṭibhiryajata icatyevainaṃ tattasmāddivā naṣṭaiṣa eti yadveva sāyaṃ dhṛtīrjuhoti prātariṣṭibhiryajate yogakṣemameva tadyajamānaḥ kalpayate tasmādyatraitena yajñena yajante kLptaḥ prajānāṃ yogakṣemo bhavati

Concerning this they say, 'Surely the horse disappears when it goes straight away; for they do not turn (drive) it back.' Now when he performs the Dhriti offerings in the evening--dhriti (keeping) meaning peaceful dwelling, and the night also meaning peaceful dwelling--it is by means of peaceful dwelling that he keeps it; whence both men and beasts rest peacefully at night. And when he performs offerings in the morning, he seeks that (horse); whence it is in daytime that one goes to seek for what is lost. And again when he offers the Dhritis in the evening, and the (Savitri) ishtis in the morning, it is security of possession the Sacrificer thereby brings about, whence security of possession is brought about for the subjects where this sacrifice is performed.