Avraham's treaty

The treaty God will remember when the exiles return to the homeland will be the treaty with Avraham, the treaty about the land. 

It would not be implausible to consider the treatment of sheviit God made with Moshe at Mount Sinai as an extension, refinement and a renewal of the treaty He made with Avraham rather than a mere elaboration of the treaty at Sinai that revolved around the Decalogue.