GOD'S WORD® Translation
He said, "Teach this [kesheth] to the people of Judah." (It is recorded in the Book of Jashar.)

American Standard Version
(and he bade them teach the children of Judah the song of the bow: behold, it is written in the book of Jashar):

Berean Study Bible
and he ordered that the sons of Judah be taught the Song of the Bow. It is written in the Book of Jashar:

Douay-Rheims Bible
(Also he commanded that they should teach the children of Juda the use of the bow, as it is written in the book of the just.) And he said: Consider, O Israel, for them that are dead, wounded on thy high places.

English Revised Version
And he bade them teach the children of Judah the song of the bow: behold, it is written in the book of Jashar.

King James Bible
(Also he bade them teach the children of Judah the use of the bow: behold, it is written in the book of Jasher.)

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):

Young's Literal Translation
and he saith to teach the sons of Judah 'The Bow;' lo, it is written on the book of the Upright: --

2 Samuel 1:18 Additional Translations ...