And the pure person shall sprinkle upon the unclean on the third day and on the seventh day, and shall purify him on the seventh day; and he shall wash his clothes and bathe in water and be pure at evening.
English: Why say “and he shall purify him on the seventh day”? It was needed: you might have thought this applies only to sacrificial food, but for terumah one day would suffice — therefore the verse teaches otherwise.
Type of Learning
Extension of the seventh-day requirement.
What Is Learned
Even for terumah the full third-and-seventh-day process is required.