By recalling once more (cf. Deuteronomy 1:37; Deuteronomy 3:26) that he was forbidden from entering the Promised Land, Moses emphasizes the importance of Israel exercising great caution. The Lord will not tolerate disobedience, no matter who commits it.
21 Furthermore, the LORD was angry with me because of you, and he swore that I should not cross the Jordan, and that I should not enter the good land that the LORD your God is giving you for an inheritance.