Numbers 14:33
Your children will be shepherds in the wilderness for forty years, and they will suffer for your unfaithfulness until the last of your bodies lie scattered in the wilderness.

Deuteronomy 29:5
During the forty years I led you in the wilderness, neither your clothes nor the sandals on your feet wore out;

Nehemiah 9:21
For forty years You sustained them in the wilderness, so that they lacked nothing. Their clothes did not wear out, and their feet did not swell.