Deuteronomy 8:4

שמלתך לא בלתה THY RAIMENT DID NOT WEAR OUT — the clouds of Divine Glory used to rub the dirt off their clothes and bleach them so that they looked like new white articles, and also, their children, as they grew, their clothes grew with them, just like the clothes (shell) of a snail which grows with it (cf. Shir HaShirim Rabbah 4:11; Yalkut Shimoni on Torah 850). לא בצקה This means: [AND THY FOOT] DID NOT SWELL like dough (בצק), as is usual with those who walk barefoot — that their feet become swollen.

שִׂמְלָ֨תְךָ֜ לֹ֤א בָֽלְתָה֙ מֵֽעָלֶ֔יךָ וְרַגְלְךָ֖ לֹ֣א בָצֵ֑קָה זֶ֖ה אַרְבָּעִ֥ים שָׁנָֽה׃

Thy garment grew not old upon thee, nor did thy foot swell, these forty years.