But he shall acknowledge the firstborn, the son of the hated, by giving him a double portion of all that is found with him; for he is the first of his strength, the right of the firstborn is his.
English: “His is the right of the firstborn” — the firstborn does not take a double portion in the mother’s property, for the verse says “his is the right of the firstborn”: the right of the firstborn belongs to a man, not to a woman.
On the daf / in context: The double portion applies only to the father’s estate. Property that belonged to the mother is divided equally among the heirs.
Type of Learning
Mi’ut from “lo” limiting the bechorah to the father’s estate.
What Is Learned
The firstborn receives a double portion only in the father’s property, not in the mother’s.