The purification ritual for a healed leper involved two birds. One was killed. The other was dipped in the dead bird's blood, mixed with spring water, and released over an open field. The Targum Jonathan adds a detail that transforms the ritual into a prophecy: if the person's leprosy returned, "the living bird will come back to his house on that day, and may be held fit to be eaten."
This is extraordinary. The Hebrew Bible says nothing about the bird returning. The Targum turns the released bird into a living diagnostic tool—a biological omen that tracks the spiritual state of the healed person. If the bird flies away and stays gone, the healing holds. If it returns, the disease will follow.
The same detail appears again with house leprosy. When a house was purified using the two-bird ritual, the Targum adds: "if it is to be that the house will be again struck with leprosy, the bird on that day will return." The killed bird, meanwhile, "shall the priest bury in the presence of the leper"—another Targum addition, specifying respectful disposal of the sacrificial animal.
The chapter describes house leprosy in Canaan with a moral twist. The Targum says God placed the plague specifically in houses built "by rapine"—through robbery or exploitation. The Hebrew Bible simply says "I put the plague of leprosy in a house." The Targum explains why: the house was corrupt because its construction was corrupt.
The color of house leprosy gets precision: "like two beans crushed with stones"—green or red spots that go deeper than the wall surface. The bean comparison is pure Targum, giving builders and priests a practical reference for identifying the plague.
At the chapter's end, the Targum distinguishes between "the day of darkness in which they may not be able to see the plague, and the day of light." Diagnosis required proper lighting. Even sacred law had practical limits.