Shatapatha Brahmana 11.1.2.9

11.1.2.9

sa yaddvābhyāmūnaṃ tadūnaṃ so'yajño yatpañcabhiratiriktaṃ tadatiriktaṃ so'yajñaḥ saiṣaiva daśatyadhi sampadeṣā viṃśatyāmeṣā sahasrāt

That (sacrifice) which is defective in two (oblations) is indeed defective, it is not a sacrifice; and that which is excessive in respect of five (oblations) is indeed excessive, it is not a sacrifice: this is that perfection as regards the ten, the twenty, thus up to a thousand.