Then the children of Judah drew near to Joshua in Gilgal: and Caleb the son of Jephunneh the Kenizzite said to him, You know the thing that Yahweh spoke to Moses the man of God concerning me and concerning you in Kadesh-barnea.
The masterful manner in which Caleb presented his appeal, the vivid recall of events which at that time were forty-five years in the past, the appeal to Joshua as a witness of Moses' sworn word, according to Woudstra, "reflect an eye-witness account."[13]  We are here dealing with events which, of all the people on earth, only Joshua and Caleb had firsthand knowledge and recall of the things mentioned, and the only fair deduction is that in those two men alone we are compelled to find the source of this material.  The ancient tradition of Joshua's authorship of this book that bears his name is strongly supported by this and other similar incidents recorded.