Shatapatha Brahmana 14.1.3.20

14.1.3.20

putravatī dakṣiṇata iti nātra tirohitamivāstīndrasyādhipatya itīndramevāsyā adhipatiṃ karoti nāṣṭrāṇāṃ rakṣasāmapahatyai prajām me dā iti prajāmeva paśūnātmandhatte tatho ha putrī paśumānbhavati

'Possessed of sons towards the south,'--in this there is nothing hidden, so to speak;--'in Indra's over-lordship,'--he thus makes Indra her over-lord for the warding off of the fiends, the Rakshas;--'grant thou offspring unto me!'--he thus secures offspring and cattle for himself, and accordingly he becomes possessed of sons and of cattle.