Atharvaveda 4.14

Since the goat has been born from the heat of Agni (the fire), it saw [its] generator in the beginning; by it the gods in the beginnings attained (i) [their] godhead; by (with?) it the sacrificial ones (médhya) ascended the ascents (róha).

Stride ye with the fire to the firmament (nā́ka), bearing in your hands vessel-[fires] (úkhya); having gone to the back of the sky, to the heaven (svàr), sit ye mingled with the gods.

From the back of earth I have ascended to the atmosphere; from the atmosphere I have ascended to the sky; from the back of the sky, of the firmament (nā́ka), I have gone to heaven (svàr), to light.

Going to heaven (svàr) they look not away; they ascend to the sky, the two firmaments (ródasī)—they who, well-knowing, have extended the everywhere-streaming sacrifice.

O Agni, go forth first of the divinities, eye of gods and of human beings (mā́nuṣa)—pressing on (? íyakṣa-) in unison with the Bhṛgus, let the sacrificers go to heaven (svàr), to well-being.

With milk, with ghee, I anoint the goat, the heavenly eagle, milky, great; by it may we go to the world of the well-done, ascending the heaven (svàr), unto the highest firmament (nā́ka).

Accompanied by five rice-messes (-odaná), by the five fingers, with the spoon, take thou up five-fold that rice-mess. In the eastern quarter set thou the head of the goat; in the southern (dákṣiṇa) quarter set his right (dákṣiṇa) side.

In the western quarter set his rump (bhasád); in the northern (úttara) quarter set his other (úttara) side; in the upward quarter set the goat's back-bone; in the fixed quarter set his belly (? pājasyà); midway in the atmosphere his middle.

Do thou envelop with cooked skin the cooked goat, brought together with all his limbs, all-formed. Do thou rise up from here unto the highest firmament (nā́ka); with thy four feet stand firm in the quarters.