Shatapatha Brahmana 10.1.3.10

10.1.3.10

tadyadetayopatiṣṭhate yadevāsyātra vidvānvāvidvānvāti vā recayati na vābhyāpayati tadevāsyaitayā sarvamāpnoti yadasya kiṃ cānāptamanuṣṭubdhāmacadbhavati vāgvā anuṣṭubvāgdhāmacadvācaivāsya tadāpnoti yadasya kiṃ cānāptam purīṣavatīṃ citiṃ kṛtvopatiṣṭhetetyu haika āhustatra hisā sarvā kṛtsnā bhavatīti

And when he stands by (the altar, worshipping it) with this (verse), he thereby secures (makes good) all that part of him (Pragâpati) which, whether he knows it or not, he either does in excess or insufficiently in this (fire-altar),--whatever has not been secured for him. The 'seat-hiding' (verse) is an Anushtubh, for the Anushtubh is speech, and the seat-hider is speech: it is by speech that he secures for him what was not secured for him. 'Let him approach (the altar with this verse) when he has covered a layer with earth,' say some, 'for then that (layer) becomes whole and complete.'