ויקרא, פרק י״ד, פסוק מ״ג

When an afflicted house undergoes quarantine, the removal of contaminated stones, and structural renovation, its ultimate fate remains undecided. The true test of its purity occurs only after the repairs are complete, when the priest returns to determine whether the affliction has been eradicated or has resurfaced. The laws governing a returning affliction apply in all cases, regardless of whether the stones are removed and the house replastered immediately following the initial quarantine or after a significant delay [הכתב והקבלה].

The primary approach among commentators is that this affliction is not a natural occurrence, such as ordinary moss or fungus. Instead, it is a divine strike indicating that an evil spirit from God rests upon the home [רמב״ן, הטור הארוך]. This spiritual reality dictates the rules of its reappearance. When an affliction returns, it does not necessarily strike the new replacement stones. Even if the mark appears in a completely different location within the home, it is treated as a returning affliction because the underlying spiritual impurity remains present [רמב״ן, הטור הארוך, רד״צ הופמן, אדרת אליהו, מלבי״ם]. However, a differing view suggests that the affliction does specifically target the newly installed stones [ביאור יש"ר].

Furthermore, the returning affliction does not need to look exactly like the original one. It renders the house impure even if it surfaces in a different color or fails to expand beyond its initial size. The very fact that the affliction has blossomed and grown anew in a freshly renovated house is intrinsically viewed as a spread, mandating the structure's demolition [רמב״ן, בכור שור, מלבי״ם, מיני תרגומא, אדרת אליהו, רד״צ הופמן]. If the affliction reappears on the exact same day the stones were removed and the walls plastered, the house is not immediately condemned and destroyed. Instead, the priest places the home under an additional week of quarantine. This waiting period allows for the possibility that the mark might naturally fade. Only if the affliction persists at the end of this extra week is the house officially declared impure and slated for demolition [רש״י, מזרחי, ריב״א, משכיל לדוד, אדרת אליהו, גור אריה, רש״ר הירש].

This strict protocol applies to a variety of timelines. While the basic scenario involves an affliction that spreads during the first week of quarantine, the same sequence of actions applies to more complex situations. If the mark remains unchanged throughout the first week, or even if it stalls for two consecutive weeks before finally spreading, the identical procedure is required: removing stones, scraping, plastering, and waiting another week. Across all these scenarios, if the affliction returns after the renovation, it is classified as a malignant plague, and the house must be completely destroyed [רמב״ן, רש״י, ריב״א, חזקוני, מלבי״ם].