כי תבואו אל ארץ כנען ... ונתתי נגע צרעת בבית ארץ אחוזתכם
A well-known Rashi teaches that the news concerning a plague of tzaraas appearing on one’s house was to be taken with a grain of salt. While at first it seems tragic that one should suffer the loss of his home, there was a rewarding caveat to the destruction of the house. When the Canaanim heard of the impending arrival of the Jews into the land which they had inhabited, they hid their treasures in the walls, so that the Jews would not benefit from them. Now that the house was destroyed, the concealed places revealed all of the hidden treasure….