Shatapatha Brahmana 8.5.1.5

8.5.1.5

atha virāja upadadhāti | eṣā vai sā virāḍyāṃ taddevā virājam pañcamīṃ citimapaśyaṃstā daśa-daśopadadhāti daśākṣarā virāḍvirāḍeṣā civiḥ sarvata upadadhāti yo vā ekasyāṃ diśi virājati na vai sa virājati yo vāva sarvāsu dikṣu virājati sa eva virājati

He then lays down the Virâgs (far-shining bricks): this Virâg, indeed, is that far-shining (virâg) fifth layer which the gods saw. He lays them down by tens: the Virâg (metre) consists of ten syllables, and this layer is 'virâg.' He places them on every side; for he who shines (rules) in one direction only, does not shine far and wide, but whosoever shines in all directions, he alone shines far and wide.