SVidhB, 1, 1, 15.1 sa yadā gāyatraṃ bṛhatyāṃ gāyati bārhataṃ jagatyām jāgataṃ triṣṭubhi samatāṃ cāpadyate /

SVidhB, 1, 1, 15.3 samā u ha vā asmiṃś chandāṃsi sāmyād iti tat sāmnaḥ sāmatvam //