On the east side the border will run between Hauran and Damascus, along the Jordan between Gilead and the land of Israel, to the Eastern Sea and as far as Tamar. This will be the eastern boundary.

Genesis 13:10
And Lot looked out and saw that the whole plain of the Jordan, all the way to Zoar, was well watered like the garden of the LORD, like the land of Egypt. (This was before the LORD destroyed Sodom and Gomorrah.)

Genesis 13:11
So Lot chose the whole plain of the Jordan for himself and set out toward the east. And Abram and Lot parted company.

Genesis 37:25
And as they sat down to eat a meal, they looked up and saw a caravan of Ishmaelites coming from Gilead. Their camels were carrying spices, balm, and myrrh on their way down to Egypt.

Numbers 34:10
And your eastern border will run straight from Hazar-enan to Shepham,

Jeremiah 50:19
I will return Israel to his pasture, and he will graze on Carmel and Bashan; his soul will be satisfied on the hills of Ephraim and Gilead.

Ezekiel 47:16
Berothah, and Sibraim (which is on the border between Damascus and Hamath), as far as Hazer-hatticon, which is on the border of Hauran.

And the east side you shall measure from Hauran, and from Damascus, and from Gilead, and from the land of Israel by Jordan, from the border to the east sea. And this is the east side.