'Book of Jasher' in the Bible

And the sun stood still, and the moon remained where it was, until the nation had avenged themselves upon their enemies. Is not this written in the book of Jasher? And the sun remained standing in the midst of heaven, and hasted not to go down about a full day.

and he bade them teach the children of Judah the song of the bow. Behold, it is written in the book of Jasher: --