Gen 26:2 I will honor the oath I swear to your Father Abraham....(5) because Abraham obey my commandments and kept my laws.
The promises of God were conditional on obedience.
peace to you
The actual covenant.
You are ignoring Genesis 15 and trying to replace it with one verse from Genesis 26, which is God speaking to Isaac. It's not even the Abrahamic Covenant. You are being deceitful with God's word in order to make a claim that is not accurate.
Genesis 15:5-8,12-15,17-21 And he brought him outside and said, “Look toward heaven, and number the stars, if you are able to number them.” Then he said to him, “So shall your offspring be.” And he believed the Lord, and he counted it to him as righteousness. And he said to him, “I am the Lord who brought you out from Ur of the Chaldeans to give you this land to possess.” But he said, “O Lord God, how am I to know that I shall possess it?”
As the sun was going down, a deep sleep fell on Abram. And behold, dreadful and great darkness fell upon him. Then the Lord said to Abram, “Know for certain that your offspring will be sojourners in a land that is not theirs and will be servants there, and they will be afflicted for four hundred years. But I will bring judgment on the nation that they serve, and afterward they shall come out with great possessions. As for you, you shall go to your fathers in peace; you shall be buried in a good old age.
When the sun had gone down and it was dark, behold, a smoking fire pot and a flaming torch passed between these pieces. On that day the Lord made a covenant with Abram, saying, “To your offspring I give this land, from the river of Egypt to the great river, the river Euphrates, the land of the Kenites, the Kenizzites, the Kadmonites, the Hittites, the Perizzites, the Rephaim, the Amorites, the Canaanites, the Girgashites and the Jebusites.”
Genesis 26:1-5 Now there was a famine in the land, besides the former famine that was in the days of Abraham. And Isaac went to Gerar to Abimelech king of the Philistines. And the Lord appeared to him and said, “Do not go down to Egypt; dwell in the land of which I shall tell you. Sojourn in this land, and I will be with you and will bless you, for to you and to your offspring I will give all these lands, and I will establish the oath that I swore to Abraham your father. I will multiply your offspring as the stars of heaven and will give to your offspring all these lands. And in your offspring all the nations of the earth shall be blessed, because Abraham obeyed my voice and kept my charge, my commandments, my statutes, and my laws.”