Ge 12:4 So Abram departed as the LORD had spoken to him, and Lot went with him. And Abram was seventy-five years old when he departed from Haran.

5 Then Abram took Sarai his wife and Lot his brother's son, and all their possessions that they had gathered, and the people whom they had acquired in Haran, and they departed to go to the land of Canaan. So they came to the land of Canaan.

6 Abram passed through the land to the place of Shechem, as far as the terebinth tree of Moreh. And the Canaanites were then in the land.

7 Then the LORD appeared to Abram and said, "To your descendants I will give this land." And there he built an altar to the LORD, who had appeared to him.

8 And he moved from there to the mountain east of Bethel, and he pitched his tent with Bethel on the west and Ai on the east; there he built an altar to the LORD and called on the name of the LORD.

9 So Abram journeyed, going on still toward the South.

The point of these verses is to show the faith and obedience of Abraham to God's promises and revelation. At 75 years old, he launched out with God, bringing with him his wife and his entire possessions, indicating that he had no intention of going back. He really stuck with God's promise!

Even though the possibility of the realization of God's promises looked dismal (Canaanites still lived there!) he pitched his tent and built an altar there.

Just as Abraham did these things in obedience to God so the Israelites must stick with God, possess the land and worship God there even though it was initially inhabited by the Canaanites.