ויקרא, פרק י״ד, פסוק מ״ב

After the infected sections of a leprous house are removed, the structure must be restored and made suitable for living once again. The empty spaces left in the wall must be carefully filled, and the surface properly covered and finished. The new stones used for this repair must be placed exactly where the original stones were removed [ביאור יש״ר, ביאור שטיינזלץ]. The repair process requires a minimum of two stones. An owner cannot simply use one large stone to fill a gap left by two missing stones; the replacement must consist of at least two new stones to replace the old ones [תורה תמימה, רלב״ג, מלבי״ם, אדרת אליהו]. Furthermore, these replacements must be natural stones rather than man-made bricks [מלבי״ם, אדרת אליהו].

The replacement stones must be brought from an entirely different location. An owner cannot dismantle another wall within the same house to patch the damaged area [תורה תמימה, רלב״ג, מלבי״ם, ביאור יש״ר, אדרת אליהו]. Additionally, the task of bringing these new stones should be carried out with speed [אבן עזרא].

Once the stones are set, the wall must be covered and plastered, reversing the earlier process of scraping the walls, to ensure the house is fit for residents [אבן עזרא, ביאור שטיינזלץ, פירושי רד צ הופמן]. Just like the stones, the soil used for this plaster must be brought from outside the house, not gathered from within. The primary approach among commentators is that this material can include crushed bricks, mixed earth, and clay, but completely excludes materials like lime and gypsum.

A significant rule applies when the affected wall is shared between two neighbors. Throughout the initial stages of breaking down the wall, removing the debris, and bringing the new stones, the neighbor acts as a full partner and shares the workload with the owner of the infected house. However, the final step of bringing the soil and plastering the wall rests entirely on the owner. The neighbor is completely exempt from participating in this finishing task.