The LORD made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates. Genesis 15:18
(It's hard to tell what God had in mind here. Was this land given to all of Abraham's "seed" (including Ishmael and his descendants) or just to the descendants of Abraham's favorite son (Isaac).
I will set thy bounds from the Red sea even unto the sea of the Philistines, and from the desert unto the river. Exodus 23:31
(The "sea of the Philistines" is probably the Meditarranean Sea, but what is "the great river"? The Nile or the Euphrates?)
And the Lord spake unto Moses, saying, Command the children of Israel, and say unto them, When ye come into the land of Canaan; (this is the land that shall fall unto you for an inheritance, even the land of Canaan with the coasts thereof:) Then your south quarter shall be from the wilderness of Zin along by the coast of Edom, and your south border shall be the outmost coast of the salt sea eastward: And your border shall turn from the south to the ascent of Akrabbim, and pass on to Zin: and the going forth thereof shall be from the south to Kadeshbarnea, and shall go on to Hazaraddar, and pass on to Azmon: And the border shall fetch a compass from Azmon unto the river of Egypt, and the goings out of it shall be at the sea. And as for the western border, ye shall even have the great sea for a border: this shall be your west border. And this shall be your north border: from the great sea ye shall point out for you mount Hor: From mount Hor ye shall point out your border unto the entrance of Hamath; and the goings forth of the border shall be to Zedad: And the border shall go on to Ziphron, and the goings out of it shall be at Hazarenan: this shall be your north border. And ye shall point out your east border from Hazarenan to Shepham: And the coast shall go down from Shepham to Riblah, on the east side of Ain; and the border shall descend, and shall reach unto the side of the sea of Chinnereth eastward. Numbers 34:1-11
Thus saith the Lord God; This shall be the border, whereby ye shall inherit the land according to the twelve tribes of Israel: Joseph shall have two portions. And ye shall inherit it, one as well as another: concerning the which I lifted up mine hand to give it unto your fathers: and this land shall fall unto you for inheritance. And this shall be the border of the land toward the north side, from the great sea, the way of Hethlon, as men go to Zedad; Hamath, Berothah, Sibraim, which is between the border of Damascus and the border of Hamath; Hazarhatticon, which is by the coast of Hauran. And the border from the sea shall be Hazarenan, the border of Damascus, and the north northward, and the border of Hamath. And this is the north side. And the east side ye shall measure from Hauran, and from Damascus, and from Gilead, and from the land of Israel by Jordan, from the border unto the east sea. And this is the east side. And the south side southward, from Tamar even to the waters of strife in Kadesh, the river to the great sea. And this is the south side southward. The west side also shall be the great sea from the border, till a man come over against Hamath. This is the west side. So shall ye divide this land unto you according to the tribes of Israel. Ezekiel 47:13-21