To enter into the order of the Son of God is the equivalent today of entering into the fullness of the Melchizedek Priesthood, which is only received in the house of the Lord.-
Because Adam and Eve had complied with these requirements, God said to them, “Thou art after the order of him who was without beginning of days or end of years, from all eternity to all eternity.” (Moses 6:67.)
Here is an illuminating passage from Section 107 of the Doctrine and Covenants which tells us how Adam was able to bring himself and his righteous posterity into God’s presence:
“The order of this priesthood was confirmed to be handed down from father to son, and tightly belongs to the literal descendants of the chosen seed, to whom the promises were made.
“This order was instituted in the days of Adam, and came down by lineage in [order] … that his posterity should be the chosen of the Lord, and that they should be preserved unto the end of the earth.” (D&C 107:40–42; italics added.)
How did Adam bring his descendants into the presence of the Lord?
The answer: Adam and his descendants entered into the priesthood order of God. Today we would say they went to the House of the Lord and received their blessings.
The order of priesthood spoken of in the scriptures is sometimes referred to as the patriarchal order because it came down from father to son.
But this order is otherwise described in modern revelation as an order of family government where a man and woman enter into a covenant with God—just as did Adam and Eve—to be sealed for eternity, to have posterity, and to do the will and work of God throughout their mortality. ("What I Hope You Will Teach Your Children about the Temple", Ezra Taft Benson, Ensign Aug 1985)