Deuteronomy 8:17 uses the same 'say in your heart' phrase to warn against attributing success to oneself, mirroring the doubt in Deuteronomy 7:17 about God's power.

Numbers 13:32 gives the spies' bad report that nations were too strong—directly illustrating the fear Moses addresses here.

Joshua 17:16-18 shows later Israelites fearing Canaanites with iron chariots—same fear of stronger nations in practice.

Numbers 33:53 commands to possess the land, countering the fear—showing God's provision despite the nations' size.