פירוש על ברכות 81:10

Cf. Lev. xiv. 46. Since he is not wearing the things, they become defiled at once. As for his actual garments, they do not become defiled (requiring washing) unless he "lieth or eateth" there; cf. v. 47.

A loaf equal in size to four eggs.

Barley-bread, being coarser, would take longer to eat. Hence "wheat" sets a standard of time in connection with the contracting of defilement.