Arcana Coelestia #4401
4401. And he erected there an altar. That this signifies interior worship, is evident from the signification of “erecting an altar,” as being worship. For an altar was the principal representative of the Lord (see n. 921, 2777, 2811), and hence also the principal thing in worship. By worship is here meant interior worship from the Divine Spiritual, which subject now follows.
Numbers 23:14-18
14
He took him into the field of Zophim, to the top of Pisgah, and built seven altars, and offered up a bull and a ram on every altar.
15
He said to Balak, "Stand here by your burnt offering, while I meet [Yahweh] yonder."
16
Yahweh met Balaam, and put a word in his mouth, and said, "Return to Balak, and say this."
17
He came to him, and behold, he was standing by his burnt offering, and the princes of Moab with him. Balak said to him, "What has Yahweh spoken?"
18
He took up his parable, and said, "Rise up, Balak, and hear! Listen to me, you son of Zippor.