2 Samuel 1:18 in the King James Version
(Also he bade them teach the children of Judah the use of the bow: behold, it is written in the book of Jasher.)
Context
17 David lamented with this lamentation over Saul and over Jonathan his son
18 (and he commanded them to teach the children of Judah the song of the bow; behold, it is written in the book of Jashar):
19 “Your glory, Israel, was slain on your high places! How the mighty have fallen!