JS composes poem for WWP, mentions "council in Kolob" in pre-existence.
Joseph Smith, "The Answer," Times and Seasons 4, no. 6 (February 1, 1843): 82, The Joseph Smith Papers website, accessed August 11, 2021
7. From the council in Kolob, to time on the earth.
And for ages to come unto them I will show
My pleasure & will, what my kingdom will do:
Eternity’s wonders they truly shall know.