Genesis 28

 As we read the vision of Jacob's Ladder, we witness the progressive steps of covenants and ordinances - 

"...behold a ladder set up on the earth, and the top of it reached to heaven: and behold the angels of God ascending and descending on it."  (Genesis 28:12)

President Marion G. Romney taught - 

“When Jacob traveled from Beersheba toward Haran, he had a dream in which he saw himself on the earth at the foot of a ladder that reached to heaven where the Lord stood above it. He beheld angels ascending and descending thereon, and Jacob realized that the covenants he made with the Lord there were the rungs on the ladder that he himself would have to climb in order to obtain the promised blessings— blessings that would entitle him to enter heaven and associate with the Lord. 

“Because he had met the Lord and entered into covenants with him there, Jacob considered the site so sacred that he named the place Bethel, a contraction of Beth-Elohim, which means literally ‘the House of the Lord.’ He said of it: ‘… this is none other but the house of God, and this is the gate of heaven.’ (Gen. 28: 17.) 

“Jacob not only passed through the gate of heaven, but by living up to every covenant he also went all the way in. Of him and his forebears Abraham and Isaac, the Lord has said: ‘… because they did none other things than that which they were commanded, they have entered into their exaltation, according to the promises, and sit upon thrones, and are not angels but are gods.’ (D& C 132: 37.)

 “Temples are to us all what Bethel was to Jacob. Even more, they are also the gates to heaven for all of our unendowed kindred dead. We should all do our duty in bringing our loved ones through them” (“ Temples— The Gates to Heaven,” Ensign, March 1971, page 16).

In addition, I personally believe the angels ascending and then descending also teaches the process of administering angels.  In my mind, administering angels from below ascend to receiving instructions and then descend to administer those directions.