YV 5.5g

For expiration, for cross-breathing, for inspiration; for speech thee; for sight thee; with that deity, in the manner of Angiras, do thou sit firm. By Agni the gods sought to go to the world of heaven, with him they could not fly; they saw these four naturally perforated bricks, they put them down in the quarters, with him with eyes on all sides they went to the world of heaven. In that he puts down four naturally perforated bricks in the quarters, the sacrificer with Agni with eyes on all sides goes to the world of a O Agni, come to enjoy', he says; verily he summons him. b 'Agni we choose as envoy', he says; verily having called he chooses him. c 'By Agni Agni is kindled', he says; verily he kindles him. d 'May Agni slay the foes', he says; verily he confers power on him when kindled. e 'O Agni, we exalt the praise', he says; verily he exalts him. These are the forms of the days [1]; verily each day he piles him, and wins the forms of the days. The theologians say, 'For what reason are other bricks exhausted, the space-filler not?' 'Because it is connected with Indra and Agni and with Brhaspati', he should say, for Indra and Agni and Brhaspati are those among the gods who are not exhausted. It has a follower to avoid monotony. He follows it with an Anustubh; the space filler is the body, the Anustubh the breath; therefore breath comes through all the limbs. 'They of him, streaming with milk' [2], he says; therefore there is sap in every joint; 'the dappled mix the Soma', he says; the dappled (cow) is food; verily he wins food; Agni is praise, food is praise; verily he wins food; 'the clans in the birthplace of the gods, in the three realms of sky', he says; verily he makes these worlds full of light for him. He who knows the support of the bricks finds support. 'With that deity, in the manner of Angiras, do thou sit firm,' he says; this is the support of the bricks; he who knows thus finds support.