Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.4.29

4.3.4.29

atha gām pratyeti | rudrāya tvā mahyaṃ varuṇo dadātviti rudrāya hyetāṃ varuṇo 'dadātso 'mṛtatvamaśīya prāṇo dātra edhi vayo mahyam pratigrahītra iti

And the cow he accepts with, 'Let Varuna give thee to me, Rudra!' for to Rudra Varuna gave her. 'May I obtain immortality! be thou breath to the giver, strength (vayas) to me, the receiver!'