(Exodus 13:15) records a foundational obligation: "and every firstling of my sons I shall redeem." The redemption of the firstborn, known as pidyon haben, is one of the Torah's most ancient rituals. But the Mekhilta identifies a legal question hidden inside this verse that expands the obligation far beyond its apparent scope.
The straightforward reading assigns the duty to the father. A man's firstborn son must be redeemed, and the father performs the redemption by paying five silver shekels to a kohen, a priest. But what happens if the father fails to do so? What if he dies before performing the ceremony, or simply neglects it? Does the obligation vanish?
The Mekhilta says no. The proof lies in the Hebrew word "efdeh," which can be read as "I shall redeem" in the first person. The verse does not say "his father shall redeem him" but rather uses a form that the Rabbis interpret as self-referential. If the father did not redeem the firstborn, the firstborn must eventually redeem himself.
This ruling means the obligation of pidyon haben never expires. It follows the firstborn throughout his life. A man who discovers at age forty that his father never performed the ceremony is still obligated to redeem himself. The duty is not merely paternal. It is personal. It attaches to the firstborn son as an individual, not just to his father as a parent.
The Mekhilta derives all of this from a single word. One verb form, one grammatical nuance, generates a legal principle that has governed Jewish practice for thousands of years.