1 Chronicles 5:9
To the east he settled as far as the entrance of the wilderness from the river Euphrates, 
Joshua 22:8-9
                            and said to 
Treasury of Scripture Knowledge
Summary
                            And eastward he inhabited unto the entering in of the wilderness from the river Euphrates: because their cattle were multiplied in the land of Gilead.                        
                    Because
Bible References
Because
                                        Joshua 22:8                                        
                                                            
                        and said to them, “Return to your tents with great riches and with very much livestock, with silver, gold, bronze, iron, and with very many clothes; divide the spoil of your enemies with your brothers.”