Joseph, when discussing the Priesthood of Abraham and Melchizedek, teaches that, unlike of Levi's, they have the sealing power.

Aug 27, 1843
Speech / Court Transcript
Joseph Smith, Jr.
Scribed Verbatim

Joseph Smith, Discourse, 27 August 1843, as Reported by James Burgess, pp. [10-12], The Joseph Smith Papers website, accessed September 22, 2021

James Burgess
Joseph Smith, Jr.
Latter-day Saints

Hebrewes 7 chapr. Paul is here treating of three different priesthoods, namely the priesthood of Aron, Abraham, and Melchesedeck, Abrahams’s priesthood was of greater power than Levi’s and Melchesedeck’s was of greater power than that of Abraham. The priesthood of Levi consisted of cursings and blessings carnal commandments and not of blessings and if the priesthood of this generation has no more power than that of Levi or Aron or of a bishoprick it administers no blessings but cursings for it was an eye for an eye and a tooth for a tooth. I ask was there any sealing power attending this priesthood Oh no that would admit a man into the presence of God. Oh no, but Abraham’s was a more exalted power or priesthood he could talk and walk with God and yet consider how great this man was when even this patriarch Abraham gave a tenth part of all his spoils and then received a blessing under the hands of Melchesideck even the last law or a fulness of the law or priesthood which constituted him a king and priest after the order of Melchesideck or an endless life. Now if Abraham had been like the sectarian world and would not have received any more revelation, what would have been the consequence it would have damned him. Book of Covenants. The levitical priesthood was an appendage to the Melchesideck—priesthood or the whole law of God when in full force or power in all its parts and bearings on the earth. It is understood by many by reading this chapter that Melchisedech was king of some country or nation on the earth, but it was not so. In the original it reads king of Shaloam which signifies king of peace or righteousness and not of any country or nation.

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