Christians don't limit themselves to just parts of what the bible tells us.
If there is a land promise ANYWHERE in scripture, it is a legit promise.
The promises to Abraham were fulfilled. Dispensationalists teach the false doctrine that God did not fulfill the promises He made to Abraham in regards to earthy Israel, and they do not recognize that God already fulfilled the spiritual promises to the spiritual Israel, the church (spiritual Israel).
Premillennialists reject the truth that Israel possessed all the land God promised to them through Abraham. God said that if Israel got all the land promised, then they would have six cities of refuge. We see from the scriptures that this has been fulfilled.
Deuteronomy 19:7-9"Therefore, I command you, saying,'You shall set aside three cities for yourself.' "If the LORD your God enlarges your territory, just as He has sworn to your fathers, and gives you all the land which He promised to give your fathers— if you carefully observe all this commandment which I command you today, to love the LORD your God, and to walk in His ways always—then you shall add three more cities for yourself, besides these three. "
Joshua 20:7 So they set apart Kedesh in Galilee in the hill country of Naphtali, Shechem in the hill country of Ephraim, and Kiriath Arba (that is, Hebron) in the hill country of Judah.
8 East of the Jordan (on the other side from Jericho) they designated Bezer in the wilderness on the plateau in the tribe of Reuben, Ramoth in Gilead in the tribe of Gad, and Golan in Bashan in the tribe of Manasseh.
9 Any of the Israelites or any foreigner residing among them who killed someone accidentally could flee to these designated cities and not be killed by the avenger of blood prior to standing trial before the assembly.
There is listed the six cities of refuge: Kadesh, Shechem, Hebron, Bezer, Ramoth, and Golan.
God gave all the earthy land promises to Abraham.
Joshua 21:43-45 "So the LORD gave Israel all the land which He had sworn to give to their fathers, and they possessed it and lived in it. And the LORD gave them rest on every side, according to all that He had sworn to their fathers, and no one of all their enemies stood before them; the LORD gave all their enemies into their hand. Not one of the good promises which the LORD had made to the house of Israel failed; all came to pass. "
Joshua 23:14-15 "Now behold, today I am going the way of all the earth, and you know in all your hearts and in all your souls that not one word of all the good words which the LORD your God spoke concerning you has failed; all have been fulfilled for you, not one of them has failed."It shall come about that just as all the good words which the LORD your God spoke to you have come upon you, so the LORD will bring upon you all the threats, until He has destroyed you from off this good land which the LORD your God has given you. "
Joshua’s promises fulfilled:
In 2 Samuel 8:3, David defeated Hadadezer, and he went to restore his rule at the Euphrates River.
1 Kings 4:21 And Solomon ruled over all the kingdoms from the Euphrates River to the land of the Philistines, as far as the border of Egypt. These countries brought tribute and were Solomon's subjects all his life.
2 Chr 9:26 And he was the ruler over all the kings from the Euphrates River even to the land of the Philistines, and as far as the border of Egypt.
Nehemiah 9:8 And Thou didst find Abraham's heart faithful before Thee, and didst make a covenant with him to give him the land of the Canaanite, of the Hittite and the Amorite, of the Perizzite, the Jebusite, and the Girgashite-- to give it to his descendants. And Thou hast fulfilled Thy promise, for Thou art righteous.
Jeremiah 11:5 "in order to confirm the oath which I swore to your forefathers, to give them a land flowing with milk and honey, as it is this day." Then I answered and said, "Amen, O LORD."
We can see from the scriptures that God gave all the earthy land promises to Abraham. Many Christians falsely teach that Israel did not get the earthy land which was promised and that the land in 1948 AD was the fulfilled land promise; which is incorrect because God completed His earthy promises before Jesus came and unbelieving Jews were CUT OFF and bound over to disobedience with the rest of the world and the only promise anyone has is through belief in Jesus Christ.