Genesis 15:19 Meaning

17And it came to pass, that, when the sun went down, and it was dark, behold a smoking furnace, and a burning lamp that passed between those pieces.

18In the same day the LORD 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:

19The Kenites, and the Kenizzites, and the Kadmonites,

20And the Hittites, and the Perizzites, and the Rephaims,

21And the Amorites, and the Canaanites, and the Girgashites, and the Jebusites.