Śatapatha Brāhmaṇa ("of a hundred paths") 9.1.1.22

9.1.1.22

athaitāni yajūṃṣi japati | namo vaḥ kirikebhya ityetaddhāsya pratijñātatamaṃ dhāma yathā priyo vā putro hṛdayaṃ vā tasmādyatraitasmāddevācaṅketa tadetābhirvyāhṛtibhirjuhuyādupa haivaitasya devasya priyaṃ dhāma gacati tatho hainameṣa devo na hinasti

He thus mutters these formulas (the last four of Vâg. S. XVI, 46), 'Reverence be to you, the sparkling (hearts of the gods)!' for this is his favourite resort, either as a dear son or the heart: hence whenever he should be in fear of that god (Rudra), let him offer with those mystic utterances, for he draws nigh unto the favourite resort of that god, and so that god does not injure him.