Chandogya Upanishad 4.78

एष ह वा उदक्प्रवणो यज्ञो यत्रैवंविद्ब्रह्मा भवत्येवंविदꣳ ह वा एषा ब्रह्माणमनुगाथा यतो यत आवर्तते तत्तद्गच्छति ॥ ९ ॥

4.17.9 — esha ha va udakpravano yajno yatraivamvidbrahma bhavatyevamvidam ha va esha brahmanamanugatha yato yata aavartate tattadgachchhati || 9 ||

That sacrifice is inclined towards the north (in the right way) in which there is a Brahman priest who knows this. And with regard to such a Brahman priest there is the following Gâthâ: 'Wherever it falls back, thither the man goes,'— viz. the Brahman only, as one of the Ritvig priests. 'He saves the Kurus as a mare' (viz. a Brahman priest who ​knows this, saves the sacrifice, the sacrificer, and all the other priests). Therefore let a man make him who knows this his Brahman priest, not one who does not know it, who does not know it.

वह यज्ञ उत्तर की ओर प्रवण (झुका हुआ) होता है जिसमें ऐसा जाननेवाला ब्रह्मा हो; ऐसे ब्रह्मा के सम्बन्ध में यह गाथा है — 'जहाँ-जहाँ वह लौट कर जाता है, वहीं वह (यज्ञमान) भी जाता है।'