Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.3.9

11.2.3.9

sa yatra śamyorāha tadabhimṛśati yajña namaśca ta upa ca yajñasya śive saṃtiṣṭhasva sviṣṭe me saṃtiṣṭhasveti sa yadatirecayati tannamaskāreṇa śamayatyatha yadūnaṃ karotyupa ceti tena tadanyūnam bhavati yajñasya śive saṃtiṣṭhasveti yadvai yajñasyānyūnātiriktaṃ tacivaṃ tena tadubhayaṃ śamayati sviṣṭe me saṃtiṣṭhasveti yadvai yajñasyānyūnātiriktaṃ tatsviṣṭaṃ teno tadubhayaṃ śamayatyevamu hāsyaitena yajñenānyūnātiriktenaiveṣṭam bhavati ya evaṃ vidvānevamabhimṛśati tasmādevamevābhimṛśette ha te gandharvā āsuḥ śūrpaṃ yavamānkṛṣirudvālavāndhānāntarvān

Now, when he pronounces the Samyos (all-hail and blessing), he touches (the earth) with (Vâg. S. II, 19), 'O Sacrifice, homage be unto thee: mayest thou complete thy course up to the success of the sacrifice and up to mine own right offering!' Wherever (in the course of the sacrifice) he has committed any excess, he makes amends for it by doing homage; and wherever he has left anything defective, it ceases to be defective by his saying, 'up to.' In saying, 'Mayest thou complete thy course up to the success of the sacrifice,'--success being whatever in the sacrifice is neither defective nor excessive--he thereby makes amends for both of these (mistakes); and in saying, 'Mayest thou complete thy course up to mine own right offering,'--right offering being whatever in the sacrifice is neither defective nor excessive--he thereby also makes amends for both of these (mistakes); and thus that sacrifice of his comes to be performed as one that is neither defective nor excessive by whosoever, knowing this, thus touches (the earth): let him therefore touch it just in this way. But, indeed, those Gandharvas were Yavamân (rich in barley), the winnowing-basket; Uddâlavân (rich in paspalum frumentaceum), husbandry; and Antarvân (the pregnant), grain.