I have led you forty years in the wilderness; your clothes have not worn out on you, and your sandal has not worn out on your foot.Amazing what God can do when He wills so. Every day we deal with things getting old, and wearing out. Our clothes, our cars, our homes, our possessions. Not a month goes by where we don't notice that something is getting rather beat up, and will probably need to be replaced soon. It's a constant source of annoyance, and sometimes a significant financial drain.
For the Isrealites, for these forty years, time almost stood still. Friction did not cause threads to unwind or fray from their weave. Molecular transfer did not wear down the soles of sandals as they contacted the ground. Moths and other creatures did not eat away at anything they could. For those forty years, it's as if entropy didn't exist. Everything stayed as it was, not needing repair or replacement. And all so that God could sustain them without the need for some more visible miracle, or the slaughter of more people to gain the supplies they needed. Just so He could show His power to them, in one more subtle way.