YV 1.5f

If he were to gather with the skin of tame animals he would afflict with pain tame animals; he gathers with a black antelope skin; verily he afflicts with pain wild animals [2]; therefore of animals of even birth the wild animals are the smaller, for they are afflicted with pain. He gathers on the hairy side, for on that side is it pure. He strews the lotus leaf and the black antelope skin together; the black antelope skin is this (earth), the lotus leaf yonder (sky); verily on both sides he encircles him with these two. Agni departed from the gods, Atharvan perceived him; 'Atharvan first pressed thee out, O Agni' [3], he says; verily he gathers him with him who perceived him. 'Thee, O Agni, from the lotus', he says, for in the lotus leaf he found him reposing. 'Thee the sage, Dadhyañc', he says; Dadhyañc, son of Atharvan, was full of brilliance; verily he bestows brilliance upon him. 'Thee Pathya Vrsan', he says; verily with the latter (verse) he hails him whom he has previously addressed [4]. He gathers with four (verses), the metres are four; verily (he gathers) with the metres. (He gathers) with Gayatri verses for a Brahman, for the Brahman is connected with the Gayatri; with Tristubh verses for a Rajanya, for the Rajanya is connected with the Tristubh; if he desire of a man, 'May he be richer', he should gather for him with both sets; verily upon him he bestows brilliance and power together. With eight (verses) he gathers; the Gayatri has eight syllables, Agni is connected with the Gayatri; verily he gathers all the extent of Agni. 'Sit thou, O Hotr', he says; verily he makes the deities sit down for him; 'The Hotr down', (with these words he makes) men (sit down); 'Sit thou down', (with these words he makes) birds (sit down); 'Be born noble in the forefront of the days', he says; verily he produces for him the common session of gods and men.