We find a "correction" in Vayera of several problematic episodes in Lekh Lekha.
The "atonement" is the acceptance that it is God who is in charge, and that it is God's promises and covenants that are eternal and are to be relied upon. God's promise of a permanent relationship with Avraham's descendants in the land that He promised can only be realized when Avraham (and his descendants) recognize their responsibility and obligation to His covenants.
The blessings of the nations are dependent on Avraham and his descendants taking their rightful place in the world. Avraham must recognize his place and the place of his family in the land, and he must teach them of the covenants - the personal and national britot with God - through which God can keep His promises to Avraham's descendants; thus, he will offer blessings to all of the nations of the world.
