Deuteronomy 29:5

And I have led you forty years in the wilderness
From the time of their coming out of Egypt unto that day, which though not quite complete, is given as a round number. Eupolemus ^F4, an Heathen writer, confirms this date of the ministry of Moses among the Israelites; he says, Moses performed the office of a prophet forty years:

your clothes are not waxen old upon you:
were not worn out; all those forty years they had been in the wilderness, they had never wanted clothes fitting for them, according to their age and stature, and which decayed not; (See Gill on Deuteronomy 8:4);

and thy shoe is not waxen old upon thy foot;
which were necessary to wear in travelling, and especially in a rugged wilderness; and yet, thought they had been always in use during so long a time, were not worn out, which was really miraculous; (See Gill on Deuteronomy 8:4).

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FOOTNOTES:

F4 Apud Euseb. Praepar. Evangel. l. 9. c. 30. p. 447.