A lot of people haven’t read it, so I’ll post it below.
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It was Oliver Cowdery who ordained and blessed the original Twelve. In some cases, the minutes note that Martin Harris and David Whitmer assisted. For other cases, we can infer that all three witnesses participated in the ordination, but the record is not clear.
https://www.josephsmithpapers.org/paper-summary/minute-book-1/153
Traditionally, we’ve all been taught that the Three Witnesses ordained the original Twelve. That’s why everyone’s Priesthood line of authority shows the Three Witnesses. It’s possible that happened, but the record for February 14, 1835, shows that the Three Witnesses ordained (blessed) Lyman Johnson, Brigham Young, and Heber C. Kimball.
The minutes say that on Feb. 15, 1835, “President Cowdery called forwarward [sic] Orson Hyde, David W. Patten and Luke Johnson and proceeded to their ordination & blessing.”
After recording the blessings of these three men, the minutes record the “blessing” of William E. McLellin, John F. Boynton, and William Smith, without explaining who ordained them.
Later, on Feb. 21, Parley P. Pratt was ordained as one of the Twelve by Joseph Smith, David Whitmer, and Oliver Cowdery. Oliver acted as voice and after the ordination, gave Elder Pratt a charge.
The same day Oliver Cowdery “blessed” Thomas B. Marsh. David Whitmer sealed that blessing. Then Orson Pratt was ordained and David Whitmer confirmed the ordination. Following that blessing, Prsident Cowdery gave the charge to the Twelve (below).
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The Three Witnesses received their priesthood authority this way:
Oliver Cowdery – Peter, James and John
David Whitmer – ordained a High Priest by Oliver Cowdery on October 25, 1831
https://www.josephsmithpapers.org/paper-summary/minutes-25-26-october-1831/5
Martin Harris – ordained a High Priest by Lyman Wight on June 3, 1831. Wight had been ordained an Elder by Oliver Cowdery on Nov. 20, 1830. [Note: Wight was ordained to the “high Priesthood” by Joseph Smith in June 1831, and then Wight ordained Joseph Smith to the “high Priesthood” at the same meeting.]
https://www.josephsmithpapers.org/paper-summary/john-whitmer-history-1831-circa-1847/32 and
https://www.josephsmithpapers.org/paper-summary/minutes-circa-3-4-june-1831/2
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until you are endowed with power from on high. You need a fountain of wisdom, knowledge, and intelligence such as you never had.
. even till the great day come. You will see what you never expected to see. You will need the mind of Enoch or Elijah & the faith of the brother of Jared. You must be prepared to walk by faith, however, appalling the prospect to human view. You, and each of you should feel the force of the imperious mandate, “Son go labor in my vineyard” and cheerfully receive what comes, but in the end you will stand while others will fall. You have read in the Revelation concerning ordination. Beware how you ordain, for all nations are not like this nation. They will willingly receive the ordinances at your hand to put you out of the way. There will be times when nothing but the angels of God can deliver you out of their hand. We appeal to your intelligence, we appeal to your understanding, that we have so far discharged our duty to you. We consider it one of the greatest condescentions of our Heavenly Father in pointing you out to us. You will be steward over this ministry. [p. 163]
Source: Letter VII