2 Samuel 1:18 in the World English Bible
(and he commanded them to teach the children of Judah the song of the bow; behold, it is written in the book of Jashar):
Context
17 And David lamented with this lamentation over Saul and over Jonathan his son:
18 (Also he bade them teach the children of Judah the use of the bow: behold, it is written in the book of Jasher.)
19 The beauty of Israel is slain upon thy high places: how are the mighty fallen!