Charles Spurgeon Commentary Genesis 15:18-21

"In that day Jehovah made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates: the Kenite, and the Kenizzite, and the Kadmonite, and the Hittite, and the Perizzite, and the Rephaim, and the Amorite, and the Canaanite, and the Girgashite, and the Jebusite." — Genesis 15:18-21 (ASV)

He mentions the adversaries to show how great would be the victories of the people who were to come and dispossess them. Let us always look upon the list of our difficulties as only a catalogue of our triumphs. The greater our troubles, the louder our song at the last.