John Gills Exposition of the Bible Commentary - Genesis 15:9
And he said unto him, take me an heifer of three years old ,.... This, with what follows, is the sign by which Abram might know that he, that is, his seed, should inherit the land of Canaan; for the whole of this is an emblem of the state and condition of his posterity, until they should enter into that land: wherefore he is ordered to "take" out of his herds and flocks this and the following creatures, which were used in sacrifice before the ceremonial law was given, as well as under it;... read more
Matthew Henry's Complete Commentary - Genesis 15:7-11
We have here the assurance given to Abram of the land of Canaan for an inheritance. I. God declares his purpose concerning it, Gen. 15:7. Observe here, Abram made no complaint in this matter, as he had done for the want of a child. Note, Those that are sure of an interest in the promised seed will see no reason to doubt of a title to the promised land. If Christ is ours, heaven is ours. Observe again, When he believed the former promise (Gen. 15:6) then God explained and ratified this to him.... read more