"I Promise", God.

As a married man and father there have been promised that I have made only to fail in keeping them. I was not able to do everything that I wanted and desired. But when God promises something He is able to do all that He says.

Having promised that Abram would indeed have a son He promised him land as well. God shows that He will keep His promise by the providing of a covenant and the by passing through the animals Abram laid out.

What we need to understand that the only promises that matter are the promises from God. Man will fail at some point and time but God will never fail.

John 10:27-28 27 "My sheep hear My voice, and I know them, and they follow Me; 28 and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand. NASU

This is a promise of God and it will not fail.

Gen 15:6-21 7 And He said to him, "I am the Lord who brought you out of Ur of the Chaldeans, to give you this land to possess it." 8 He said, "O Lord God, how may I know that I will possess it?" 9 So He said to him, " Bring Me a three year old heifer, and a three year old female goat, and a three year old ram, and a turtledove, and a young pigeon." 10 Then he brought all these to Him and cut them in two, and laid each half opposite the other; but he did not cut the birds. 11 The birds of prey came down upon the carcasses, and Abram drove them away.
12 Now when the sun was going down, a deep sleep fell upon Abram; and behold, terror and great darkness fell upon him. 13 God said to Abram, "Know for certain that your descendants will be strangers in a land that is not theirs, where they will be enslaved and oppressed four hundred years. 14 "But I will also judge the nation whom they will serve, and afterward they will come out with many possessions. 15 "As for you, you shall go to your fathers in peace; you will be buried at a good old age. 16 "Then in the fourth generation they will return here, for the iniquity of the Amorite is not yet complete." 17 It came about when the sun had set, that it was very dark, and behold, there appeared a smoking oven and a flaming torch which passed between these pieces. 18 On that day the Lord made a covenant with Abram, saying,
" To your descendants I have given this land,From the river of Egypt as far as the great river, the river Euphrates: 19 the Kenite and the Kenizzite and the Kadmonite 20 and the Hittite and the Perizzite and the Rephaim 21 and the Amorite and the Canaanite and the Girgashite and the Jebusite." NASU