Moses sware on that day See Deuteronomy 1:35-36. What is here mentioned was first pronounced by God himself, and that with an oath, Numbers 14:21-24. It was also, however, repeated by Moses, so that the expression of the sacred writer is just.
Related Commentaries of Joshua 14:9
Joshua 14:9
9 And Moses sware on that day, saying, Surely the land whereon thy feet have trodden shall be thine inheritance, and thy children's for ever, because thou hast wholly followed the LORD my God.