Is God's promise to Abraham about land a heavenly or an earthly promise?

God's promise to Abraham about land is an earthly promise, not a heavenly one. It concerns a geographical area of land on the planet, specifically the eastern end of the Mediterranean, promised to Abraham and his seed forever. It involves people, not angels.

Les teaches that this promise is earthly, not heavenly. He emphasizes that it is on the planet, not something up in heaven. Genesis 13 records God telling Abraham to lift up his eyes and look northward, southward, eastward, and westward, and promises all the land he sees to him and his seed forever. Les explains this is a geographical area of land on the eastern end of the Mediterranean, and Abraham's descendants would be multiplied as the dust of the earth and sand of the sea—people, not angels.

Genesis 12:1

Now the LORD had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father’s house, unto a land that I will shew thee:

What did God promise Abraham?

God promised Abraham that out of him would come a distinctive race and nation, the nation of Israel. The promises given to Abraham and Israel were earthly, marking them as a special, called out, separated, covenant people of God. This made them God's earthly people.