Deuteronomy
King James Version (KJV)

“And we took at that time out of the hand of the two kings of the Amorites the land that was on this side Jordan, from the river of Arnon unto mount Hermon;”
King James Version (KJV)
3:8 On this side Jordan - So it was when Moses wrote this book; but afterward when Israel passed over Jordan it was called the land beyond Jordan.